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transformation可数吗,数学基础系列:集合与数详细介绍

本文目录一览: 最后一句是不是少了什么成分?(英语语法

按照英语语法,这里并不缺少什么。than is …相当于说than(what) is… 地道的英语表达中,这里并不出现what这样的代词。
than is possible at the moment的隐性语法结构是: than the transformation of [many] of the lives of the 5m people who have lost a hand, or were born without one is possible at the moment。[many]是比较标准“无标记词”,表示“一定的数量”,修辞上要求比较标准[many]不能在显性语法结构(即自然语言语法结构)中出现,影响整个比较分句的主语都不能出现,按照省略的标准比较分句没有省略什么成分。要理解语义关系必须从隐性语法结构。
一般情况下的话,我觉得像这种的话,应该就是缺少了一个主语的,这个成绩分嘛,所以说一般情况下的话,还是建议大家可以直接添加上就行了
是的,is前少了that,根据上下文可以省略。
是的,后面的句子缺少主语。准确的说是省略了主语。than作为连词,后面是一个比较状语从句。因为这个从句的主语和前面的成分一致。所以省略了。看起来好像是不对的。但只是发生了省略现象。没有语法错误。
If it, or something similar, goes into production, that will permit the transformation of many more of the lives of the 5m people who have lost a hand, or were born without one, than is possible at the moment.
如果它或类似的东西投入生产,这将使500万失去一只手或生来没有一只手的人的生活发生比目前更多的变化。
If it, or something similar, goes into production, 这句话是条件状语从句,or something similar是插入语。
that will permit the transformation of many more of the lives of the 5m people who have lost a hand, or were born without one, than is possible at the moment.主语that(指这项技术),谓语will permit,宾语the transformation
of many more和of the lives of the 5m people who have lost a hand, or were born without one, 这两个介词短语都是修饰transformation
many more (transformations), than is possible at the moment.这里transformation应该理解成多种变化,可数,用many修饰
整体是一个more...than结构,前面有many修饰,后面应该接可数名词。如:
若more受much或many的修饰,则应分别与不可数和可数名词连用。
His car cost much more money than mine.
他的小汽车所花的钱比我的多得多。
There are many more people than we expected.
比我们想象的人要多得多。
以上是个人理解,供参考。

information 可数吗

不可数
information 英[??nf??me??n] 美[??nf?r?me??n]
n. 消息; 信息,数据; 通知; 知识;
[例句]Pat refused to give her any information about Sarah.
帕特拒绝向她提供任何关于萨拉的消息。
[其他] 形近词: transformation neoformation reformation
双语例句 柯林斯词典 英英释义 百度百科

苏菲的世界里的精彩的有哲理的句子,要英文的。

Nature was in a constant state of transformation 自然是个不断转换的状态---适用于能量守恒的表达哦!
There had to be "something" that all things came from and returned to. 必然会有这个一种物体存在,世间万物来自于它,又变回为它。
There must be an underlying substance that is the source of all natural change.
必该有一种潜在存在的根本物质,它是所有自然变化的源泉。
Everythng that exists had always existed.每个存在的事物都是一直存在着的。(现在看到的某个存在的个体其实古往今来都一直存在。)
Nothing could become anything other than it was。没有任何动起可以真的变成除其本身以外的东西。
Cannot step twice into the same river.不能2次踏进一样的河流。
When I step into the river for the second time, neither I nor the river are the same.当我第二次踏进一条河流时,我和河流都已近与以前不同了。
The world is characterized by oppoites. If we never ill, we would never know what is was to be well. 世界以被相反证明的方式得以被感知。如果我们从来不生病,也就永远不会感觉到什么是健康。
Both good and bad have their inevitable place in the order of things.Without this constant interplay of opposites, the world would cease to exist. 好与坏在事物的秩序中都有其位置。没有相反事物不停的相互作用,世界的存在也就停止了。
Understanding will always require some effort. 理解总是要付出努力才能达到的。
Philosophy is was not something you can learn; but perhaps you can learn to think philosologically. 哲学不是通过学而能得到的,但也许你能学着哲学地去思考问题。
注意can,表示 be able to=能力可及。看到第一句话的第一反应是他认为苏菲没有这个天资学习哲学,后来一想应该指的是哲学本来就不是科学一样可以通过学习去掌握的一门学科,但哲学的思考问题的思维方式是我们可以去学习的,所以出现后面那句: perhaps you can learn to think philosologically
经典词汇用法:
How they arrived at this idea is hard to say 得到这个观点,想到这点
liberate itself from religion。liberate one from。。。从。。。解放出来
all life originated from water 源于。。。
He calculated the height of a pyramid by measuring its shadow at the precise moment when the height of his own shadow was equal to his height. 他通过在他影子和他的高度正好相等的那一刻,测量了金字塔的影子从而测量出一个金字塔的高度。---此句小时候看中文的时候一直在想怎么表达。。。
。。。does not tally with our reason 与。。。相吻合,符合
take (no) pleasure in doing sth 并不因做。。。而感到愉快
any number of c.npl. 任何数量的。。。(可数名字复数)
Nature is built up of 。。。有。。。构成。这个形象的表达常被中国人遗忘=be composed of,consist of
Getting a love letter two days in row would be doubly embarrassing. 两倍的尴尬=真是尴尬
They don‘t just appear out of thin air 凭空出现
She decided to keep a careful wathch the following day. 仔细观察。keep 与 the fllowing day 连表示时间的延续
She has he whole week ahead of her。与时间连用,指接下来有多少时间。
嘿嘿,大家一定不知道我们小时候搭房子汽车的积木和塑料三维拼凑的玩具怎么说吧,就叫lego!一块块分来,叫lego block
what had it to do with philosopy was beyond her. beyond sb.--超出了某人的理解范畴。
eternal and immutable 永恒不变的----相反:come and go
“a-tom “means “un-cuttable“ “原子”意思是“不可切分的”

请帮忙核对下有无语法错误。

Nowadays, (不用逗号)in people's daily life, bad(改为unhealthy) diet custom(社会、种族、民族的长期的行为习惯用custom,个人的习惯用habit) and lacks (不可数)of exercise, in addition to(该短语用来表示除了什么之外引出更重要的内容) weight neglect(用名词才对) of themselves, so(前面主句不完整) obesity become(单数动词) a hidden danger(用threat) to people(所有的人?抽象的人?应该是对某些人而言如此), therefore the purpose of this electronic body scale is facilitates(用带to的不定式) the people while weigh weight(表达欠妥), use weight sensing and fixed position sensing through the AD transform and simulate(?) data, with the processor operate and judge(with引导的短语不能用动词原型), then obtained(主语呢?) whether(也没有主语) surpassed the standard body weight.
到这出现第一个句号,前面这个长句结构存在不少问题,语言表达问题也较多。后面的不一一指出了。
At the last, it display the results(改用statistics数据为好) through(显示在液晶屏幕上用on) LCD. At this time the users are be able to have an certain understanding of their weight healthy. This paper propose an Electronic body scale using embedded technical(你是想说“该产品使用了….技术”吧?) with the S3C44BOX ARM Ship(应该是chip吧?) which is the product of Samsung company.
___________________
Nowadays unhealthy diet habits and lack of exercise in daily life accompanied by negligence of weight lead to many people's obesity, which poses a hidden threat to their health. The purpose of this electronic body scale is to facilitate body weighing by using weight sensing through AD transformation and data simulation. After calculation and evaluation, the processor will display all relevant statistics on the LCD to show if the user has exceeded standard weight, thus acquainting him with his health status.
This paper introduces the electronic body scale embedded with the S3C44BOX ARM Ship which is a product of Samsung technology.
如此抄袭!厚颜无耻!!!---
他们是:
萧萧雪 - 见习魔法师 二级
紫色天使的爱恋 - 见习魔法师 二级
++++++++++++++++++++++++++++++++++++++++++++++++++++
先修改并简单说明如下:
Nowadays, (不用逗号)in people's daily life, bad(改为unhealthy) diet custom(社会、种族、民族的长期的行为习惯用custom,个人的习惯用habit) and lacks (不可数)of exercise, in addition to(该短语用来表示除了什么之外引出更重要的内容) weight neglect(用名词才对) of themselves, so(前面主句不完整) obesity become(单数动词) a hidden danger(用threat) to people(所有的人?抽象的人?应该是对某些人而言如此), therefore the purpose of this electronic body scale is facilitates(用带to的不定式) the people while weigh weight(表达欠妥), use weight sensing and fixed position sensing through the AD transform and simulate(?) data, with the processor operate and judge(with引导的短语不能用动词原型), then obtained(主语呢?) whether(也没有主语) surpassed the standard body weight.
到这出现第一个句号,前面这个长句结构存在不少问题,语言表达问题也较多。后面的不一一指出了。
At the last, it display the results(改用statistics数据为好) through(显示在液晶屏幕上用on) LCD. At this time the users are be able to have an certain understanding of their weight healthy. This paper propose an Electronic body scale using embedded technical(你是想说“该产品使用了….技术”吧?) with the S3C44BOX ARM Ship(应该是chip吧?) which is the product of Samsung company.
___________________
Nowadays unhealthy diet habits and lack of exercise in daily life accompanied by negligence of weight lead to many people's obesity, which poses a hidden threat to their health. The purpose of this electronic body scale is to facilitate body weighing by using weight sensing through AD transformation and data simulation. After calculation and evaluation, the processor will display all relevant statistics on the LCD to show if the user has exceeded standard weight, thus acquainting him with his health status.
This paper introduces the electronic body scale embedded with the S3C44BOX ARM Ship which is a product of Samsung technology.
如果都这样的话谁还来帮助他人翻译?
Nowadays, in people's daily life, bad diet custom and lacks of exercise,
diet - dieting, lacks - lack
in addition to weight neglect of themselves,
"not watching their own weight"更通顺
so obesity become a hidden danger to people,
以上文构造, 这里得把so变为caused
therefore the purpose of this electronic body scale is facilitates the people while weigh weight,
这里得全该
use weight sensing and fixed position sensing through the AD transform and simulate data,
use - using
with the processor operate and judge,
operate - operation judge - monitoring 这句得看原文才能完全修改, 不过先修改语法错误
then obtained whether surpassed the standard body weight.
得全改
At the last, it display the results through LCD.
还没到最后一点,所以At the last改为furthermore
At this time the users are be able to have an certain understanding of their weight healthy.
得全改
This paper propose an Electronic body scale using embedded technical with the S3C44BOX ARM Ship which is the product of Samsung company.
propse - introduce technical - technology Ship - Chip???
修改后的结果, 文章应通顺了。 语法错误基本消除.
Nowadays, in people's daily life, bad dieting customs, lack of exercise, in addition to not watching their own weight, caused obesity to become a hidden danger to people. Therefore, the purpose of this electronic body scale is to make weighing a easier process for people. Using weight sensing and fixed position sensing through the AD transform and simulation data, along with processor controlled operation and monitoring, this scale can determine whether the person using it has surpassed the standard body weight. Furthermore, the scale displays the results through a LCD. At this time the users will be able to obtain some knowledge regarding their healthiness. This paper introduces an Electronic body scale made with embedded technology using the S3C44BOX ARM Chip, a product of the Samsung company.
上面的“一问啥不知”先生,你攻击了那么多人,可是你自己翻译的也不怎么样啊!我觉得一个键客不该如此攻击他人的“软件翻译”什么的,因为“来者是客”,任何一个回答者都是楼主的朋友,无论能力如何都算献出了自己的一份努力,你在这方面表现还是比较典型的,攻击我的也就算了,可是千万别跟试用期的过不去啊!人家水平是比较低,但是这不够构成外语版面为某些高手独家垄断的理由吧?我已经注意好多次了没有说你。
这道题快过期了,我来看看吧!错误还是很多的,你没有提供原始汉语文献,对照起来比较困难,但是还是完成了,希望你仔细看看,不要等到问题完全过期也不来处理。
Nowadays, obesity becomes a potential danger to people in their daily lives for their bad diet custom, lack of exercise, as well as the neglect of their body weight. Therefore, the objective of this electronic body scale is to help people weigh their weight by using weight sensors and fixed position sensors through AD transformation and data simulation with the operation and judgment of the processor. Thus people know whether their weight surpass the standard. At last, it shows the results in LCD. By doing this, the users are able to have a certain conclusion of their weight healthy. This paper recommends an electronic body scale using embedded technology with the S3C44BOX ARM chip produced in Samsung Company.
Nowadays bad diet habit and lack of exercise exist in people's daily life in addition to weight neglect themselves, so obesity becomes a threatened to people's health, therefore the purpose of the introducing an electronic body scale is to help people to weigh body, body's weight is showed by using the data of weight and position sensors through AD transform and simulated data .The processor will show the data after operating and judging,throug which it will see whether to surpass the standard body weight. At last, it displays the exact result on LCD. At this time the users are able to have an certain understanding of their healthy body. This paper explains that an Electronic body scale is to use embedded technology with the S3C44BOX ARM Ship , which is the product of Samsung company.
注: 在最后一句话里,"ARM Ship" 的后面必须有一个逗号,因为这是一个非限制性定语丛句,起一个解释说明的作用,并不是修饰限制作用.
Nowadays, (不用逗号)in people's daily life, bad(改为unhealthy) diet custom(社会、种族、民族的长期的行为习惯用custom,个人的习惯用habit) and lacks (不可数)of exercise, in addition to(该短语用来表示除了什么之外引出更重要的内容) weight neglect(用名词才对) of themselves, so(前面主句不完整) obesity become(单数动词) a hidden danger(用threat) to people(所有的人?抽象的人?应该是对某些人而言如此), therefore the purpose of this electronic body scale is facilitates(用带to的不定式) the people while weigh weight(表达欠妥), use weight sensing and fixed position sensing through the AD transform and simulate(?) data, with the processor operate and judge(with引导的短语不能用动词原型), then obtained(主语呢?) whether(也没有主语) surpassed the standard body weight.
到这出现第一个句号,前面这个长句结构存在不少问题,语言表达问题也较多。后面的不一一指出了。
At the last, it display the results(改用statistics数据为好) through(显示在液晶屏幕上用on) LCD. At this time the users are be able to have an certain understanding of their weight healthy. This paper propose an Electronic body scale using embedded technical(你是想说“该产品使用了….技术”吧?) with the S3C44BOX ARM Ship(应该是chip吧?) which is the product of Samsung company.
___________________
Nowadays unhealthy diet habits and lack of exercise in daily life accompanied by negligence of weight lead to many people's obesity, which poses a hidden threat to their health. The purpose of this electronic body scale is to facilitate body weighing by using weight sensing through AD transformation and data simulation. After calculation and evaluation, the processor will display all relevant statistics on the LCD to show if the user has exceeded standard weight, thus acquainting him with his health status.
This paper introduces the electronic body scale embedded with the S3C44BOX ARM Ship which is a product of Samsung technology. Nowadays, (不用逗号)in people's daily life, bad(改为unhealthy) diet custom(社会、种族、民族的长期的行为习惯用custom,个人的习惯用habit) and lacks (不可数)of exercise, in addition to(该短语用来表示除了什么之外引出更重要的内容) weight neglect(用名词才对) of themselves, so(前面主句不完整) obesity become(单数动词) a hidden danger(用threat) to people(所有的人?抽象的人?应该是对某些人而言如此), therefore the purpose of this electronic body scale is facilitates(用带to的不定式) the people while weigh weight(表达欠妥), use weight sensing and fixed position sensing through the AD transform and simulate(?) data, with the processor operate and judge(with引导的短语不能用动词原型), then obtained(主语呢?) whether(也没有主语) surpassed the standard body weight.
到这出现第一个句号,前面这个长句结构存在不少问题,语言表达问题也较多。后面的不一一指出了。
At the last, it display the results(改用statistics数据为好) through(显示在液晶屏幕上用on) LCD. At this time the users are be able to have an certain understanding of their weight healthy. This paper propose an Electronic body scale using embedded technical(你是想说“该产品使用了….技术”吧?) with the S3C44BOX ARM Ship(应该是chip吧?) which is the product of Samsung company.
___________________
Nowadays unhealthy diet habits and lack of exercise in daily life accompanied by negligence of weight lead to many people's obesity, which poses a hidden threat to their health. The purpose of this electronic body scale is to facilitate body weighing by using weight sensing through AD transformation and data simulation. After calculation and evaluation, the processor will display all relevant statistics on the LCD to show if the user has exceeded standard weight, thus acquainting him with his health status.
This paper introduces the electronic body scale embedded with the S3C44BOX ARM Ship which is a product of Samsung technology.

阅读更多 >>>  lessthan,less than与lessthan的区别

数学基础系列:集合与数

本文旨在整理一些集合论中的基础概念与定理,主要出处见参考文献。
本文只列出特别简单的证明,略去复杂的证明。
首先,我们介绍 Cartesian product(笛卡尔积、直积) ,就是从 中、 中各取一个元素组成的有序数对。如果是 个集合,它们的Cartesian product就是一个 -tuples:
所谓 Relation(关系) ,是 的任一子集,就叫a relation on set 。如果 ,则可写为 。 可能的性质有:
Equivalence relation(等价关系) ,就是自反、对称、传递的关系。
给定 上的一个equivalence relation ,那么 中的元素 的 equivalence class(等价类) ,就是集合 。若 和 是 和 的等价类,那么必有 或 。
自反、反对称、传递的relation,就叫 partial ordering(偏序) ,可以用符号 或 表示。对于任意partial ordering,如果将其中的 元素剔除,就变成了 strict ordering ,用符号 或 表示,这种relation不再是自反的和反对称的,但依旧有传递性。如果对于集合 ,每一对 都满足 、 或 这三种中的一种,那么称 是 linearly ordered 。再进一步,定义集合 的最小元素为 ,它满足 (最大元素可类似定义),那么,如果linearly ordered 的每一个子集都有一个最小元素,则称 是 well-ordered 。
一个 mapping/transformation/function 定义为 ,这是一种将 中的每个元素与 中唯一一个元素联系起来的规则。 称为 domain(定义域) , 为 codomain(到达域) ,集合 称为 graph of 。集合 称为 在 下的 image ,对于 ,集合 称为 在 下的 inverse image 。集合 称为 的 range(值域) ,若 则称该mapping为from onto ,中文叫满射,否则是 into 。若每个 都是唯一的 的image,则该mapping是 one-to-one ,或记为 - ,中文叫单射。
当 中的每个元素与 中不一定唯一的元素对应起来的规则,称为correspendence, 就是一个correspendence,但未必是mapping。若mapping是 - 且是onto的,则称该mapping为 one-to-one correspendence 。如果在 和 上都定义了partial ordering,那么如果对于一个mapping, 当且仅当 ,就称该mapping为order-preserving。若 是partial ordered,用 表示,那么一个 - mapping可以 induce(诱导) 在codomain上的一个partial ordering。若这个mapping还是onto,那么 上的linear ordering可以induce一个 上的linear ordering。
集合中的元素个数称为集合的 cardinality 或 cardinal number(基数) 。若 与 之间存在 - correspondence,那么两个集合 equipotent(等势) 。
将正自然数集合 的cardinal number记为 。如果一个无限集合中的元素,与 中的元素存在 correspondence,那么称该集合为 countable 或 denumerable (可数的)。
整数集 是可数的,因为对于任意 ,让它对应于 即可。
定理 :有理数集 可数。
定理 :The union of a countable collection of countable sets is a countable set.
注:Collection有的地方翻译为“搜集”,可理解为允许有重复元素的集合。
定理 :实数集 是不可数的。
记 的cardinal number为 ,则有 。
定理 :任意开区间不可数。
定理 :任意开区间与 是equipotent的。
对于开区间 ,将任意 映射为 可证。
定理 :实数平面 与 是equipotent的。
定理 :任意开区间都包含至少一个有理数。
对于开区间 ,不妨假设 ,取 为比 大的最小整数,取 为比 大的最小整数,则必有 ,而 。
推论 :Every collection of disjoint open intervals is countable.
因为每个开区间都至少包含一个有理数,这些不相连的开区间的collection可用其中每个开区间中的任一有理数建立对应关系,而有理数集是可数的。
下面再介绍一些有关集合的定义。集合 的supremum,如果存在,就是对于任意 都满足 的最小的 ,可写为 ;反之可定义集合 的infimum,写为 。对于 的某个子集,如果有上界,必有supremum,如果有下界,必有infimum。若定义 extended real line (即将无穷大也看作一个元素),那么所有集合都有supremum和infimum。另外记 。
Monotone sequence(单调序列) 就是 non-decreasing (指 )或 non-increasing 指 )的序列,也有严格的单调序列,即将包含关系换成严格包含关系 和 。
序列的 limit(极限) ,就是对于non-decreasing序列的 ,或对于non-increasing序列的 ,分别可写为 和 ,或一般地, ,或 。
对于任意集合序列 ,集合 必为non-increasing序列,因此 存在,称它为 的superior limit,写为 。反之,non-decreasing序列 的极限 ,就是 的inferior limit,写为 。正式定义为 由De Morgan' s laws, 。
其实就是 infinitely many (无穷多)个 中都含有的元素的集合, 就是 all but a finite number (除有限)个 外,其他 中都含有的元素的集合。
以上概念提供了一种集合序列的收敛准则: ,若两个集合不相等,则说明 不收敛。
所有 的子集的集合成为 的power set(幂集),记为 。对于一个countable set,认为它的power set有 个元素。
定理 : 。
接下来,要研究的是给定集合的子集的一些性质。Power set一般对研究的问题来说会显得太大了,以下的一系列定义,目的是要定义出 的某个子集,使得该子集对于研究的问题来说足够大,而其性质又让我们可以容易地处理。一般方法是,先选出一些已知性质的集合,组成一个基本的collection,再用一些特定操作,创造出新的集合加入其中。
定义 Ring(环) :由集合 的子集组成的非空类(nonempty class) ,若满足如下性质则为ring:
Ring对于union、intersection、difference的操作是closed(闭的)。但ring中不一定含有全集 自身,若加入 ,就成了field(或algebra)定义:
定义 Field(域) :由 的子集组成的class ,若满足如下性质则为field:
如果给定了一个collection ,将它理解为“种子”,去生成field,那么称最小的含有 的field为 field generated by 。
Ring和field的概念在概率论中应用起来还是会有些限制,因此引入以下定义:
定义 Semi-ring :由集合 的子集组成的非空类(nonempty class) ,若满足如下性质则为semi-ring:
其中的第三个性质,简单来说就是 中任意两个集合的的差,可以分解为有限个 中集合的union。
再在semi-ring中加入 自身,就变成了 semi-algebra 。
上一节说到field对complement和finite union的操作是closed,我们接着将它的finite union操作扩展到极限处,这就有了如下概念。
定义 -field(sigma-algebra) :由 的子集组成的class ,若满足如下性质则为sigma-field:
-field对于complement和countable union是closed。若给定一个collection ,所有含有 的 -field的交集,就叫 -field generated by ,可记为 。
定理 :若 是一个finite collection,则 也是finite,否则 总是uncountable。
若取 , ,则 就叫 Borel field of ,一般可记为 。许多不同的collection都可以生成出 。若给定一个实区间 ,则 称为the restnctlon of to ,或Borel field on 。事实上, 可由 生成。
对于两个 -field的union不一定是 -field,将最小的包含了两个 -field 和 中所有元素的 -field记为 。但对于两个 -field的intersection ,它必定是 -field,为了统一符号,可以写为 ,它就是保证元素同时属于 和 的最大的 -field。这两个概念都可以推广到可数多个的情形。
概率论和测度论中,大量的工作都是在证明某个class of sets是 -field。对于证明来说, -field定义中的三条性质,前两条都很容易验证,但最后一条要验证却很困难。为此我们定义一种monotone class(单调类) ,它也是由一些集合组成:若 是monotone sequence,有极限 ,且 ,则 ,称这样的 为monotone class。利用它和下面的定理,可以方便地证明一些class是 -field。
定理 : 是 -field,当且仅当 是field且它是一个monotone class。
利用这个定理,在考虑一个class是不是 -field时,我们只需要考虑monotone sequences的极限是否属于它即可。
另一个常用的技巧是Dynkin's - Theorem。对此需要先介绍两个概念做铺垫。
定义 -system :有一个class ,若 且 ,则 ,那么 就是 -system。
定义 -system :有一个class ,若它满足以下性质,那么 就是 -system:
前两个条件说的是 -system对于complement是closed。并且由于第二条意味着 ,所以第三条也说明了, 中的disjoint sets的countable union依然在 中。利用这点,有以下定理。
定理 :一个class 是 -system,当且仅当:
-field必定是 -system,同时是 -system和 -system的class必定是 -field。
下面的定理用到了这些定义。
定理 Dynkin's - Theorem :若 是一个 -system, 是一个 -system,且 ,则 。

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involution可数吗

innovation作为革新、创新的意思来讲,是不可数的。但作为新方法、新制度、新事物的意思来讲是可数的。
下面列举出用involution造的句子:
Necessary and sufficient condition of 2 - dimension projective transformation being involution.二维射影变换是对合的充要条件。
Thymic involution caused by child abuse might lead to secondary immunodeficiency.儿童虐待所致的胸腺退缩可能导致继发性免疫机能不全。
Study of the automatic involution machine metronic and the quality of metallic capacitor component.自动卷制机与金属化电容器元件质量探讨。
The presence and development of fieldbus has brought an involution in industry control field.现场总线的产生和发展引发了工业控制领域的一场革命。
The presence and development of field - bus has brought an involution in industry control field.现场总线的产生和发展引发了工业控制领域的一场革命。
The discovery and its significance of late quaternary involution in the area of lower reach of qingshuihe river , ningxia , china.宁夏清水河下游晚更新世冰卷泥的发现及意义
That which is from fortune is not separated from nature or without an interweaving and involution with the things which are ordered by providence.交好运得来的,也离不开自然,离不开天意安排的种种组合与融汇。
The universe is either a confusion , and a mutual involution of things , and a dispersion ; or it is unity and order and providence.宇宙或者是一种混乱,是事物的相互纠缠,是一种散布,或者是一个整体,有序而且蒙受天恩。
A simple proof of kosniowski - stong ' s formula is given using the fundamental theorem of the bordism theory of manifolds with involutions.利用带对合协边理论的基本定理给出了kosniowski - stong公式的一个简单且自然的证明。

period是可数名词吗

period
英音 [ 'pi?ri?d ] ; 美音 [ 'pi?ri?d ]
可数名词:
1.时间;时期;阶段;时代
2.(the period)该时期;当代
3.【地】纪
4.周期
5.【数】(小数点后的)循环节
6.经期
7.课时;(比赛的)局
8.【医】病期
9.【美口】结束;终止
10.【美】句号;句点
11.完整句;(periods)藻饰的文辞
12.【音】乐段
13.格律群
14.目标;目的
a.
早期的;当时特有的
int.
【美口】(用于事实或看法后表示强调)就是这话;就是这么回事
可数
period是可数名词。
一、读音:英 ['p??ri?d];美 ['p?ri?d]    
二、意思:n. 一段时间;周期;时期;课时;学时;句号;月经
三、词汇用法/搭配:
1、period的基本意思是“一段时间”,是可数名词,复数形式为periods。
2、period可作“时期,时代”解,指某个历史阶段或时期; 也可作“课时,学时”解; 还可作“月经(期)”解。
3、在美式英语中period的意思是“句号,句点”,相当于英式英语的a full stop。
扩展资料:
近义词:age
一、意思:
n. 年龄;时代;时期;长时间
v. (使)变老;(使)陈化
二、读音:英 [e?d?];美 [e?d?]    
三、例句:
The child is at an impressionable age.
这孩子正处于易受影响的年龄。
四、词汇用法/搭配:
1、age的基本意思是“年龄”“年纪”,引申还可指“长时间”, age还可指具有某种显著特征,或以杰出人物命名的历史时代,也指地质学、考古学中的“时代”。
2、age表示“年龄”,可用作可数名词或不可数名词,表示“时代”,是可数名词,多用作单数形式,且以大写字母开头。

词:novelty

英英释义:the quality of being new, unusual, and interesting

例句:The novelty of a thing can wear off soon.

2. 为什么选这个词?

我们很熟悉 novel 除了作名词有“小说”的意思之外,还可以作形容词表示“新奇的、新颖的”,今天我们学习它的名词形式 novelty。“novelty”可以是可数名词也可以是不可数名词,我们着重学习它作不可数名词的用法。作不可数名词指的是“新意、新奇”这一特质,作可数名词指的是“新鲜的体验”。我们在口语和写作中可以用 novelty 替换 newness 和 freshness。下面通过几个例子掌握它的用法。

我们经常会说一件物品的新鲜感很容易消失,就可以说:

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The novelty of a thing can wear off soon.

比如,很多小孩子喜新厌旧,好好的玩具玩几天就不玩儿了,我们就可以说:

The novelty of the toys soon wore off and the children got bored with them.

不仅仅是物品,人的经历也一样。很多人刚换工作可能会觉得很有趣,但没过多久新鲜感就不复存在了,我们可以说:

The novelty of a new job can soon wear off.

现在很多商家迭代产品的频率非常高,就是为了迎合消费者对新奇和个性的需求,就可以说:

Many businesses today change their products fairly rapidly to cater to consumers' desire for novelty and individualism.

下面来看《经济学人》中的几个例子:

1)Digital transformation has gone from novelty to norm.

2)The entertainment business is fast-moving by its very nature. It has few tangible assets, it relies on technology to distribute its wares and its customers crave novelty.

3)Robots struggle to operate on the basis of incomplete information, or to adapt to novelty as quickly as humans do.

4)Yet, explains Mr Vyskub, the technology’s novelty and complexity have provided some cover: “Most officials don’t understand what we’re doing, so they don’t sense the threat.”

3. 怎样学会使用这个词?

翻译下面的句子:

团队成员喜欢这个方法的新颖性。

(参考翻译:Team members like the novelty of the approach.)

ETL工具Kettle在执行转换(Transformation)时,是按照组件的箭头连接顺序执行的吗?

是并行执行的,现在还不支持串行。据说4.0以后支持。
不过应该对你处理数据的影响不大,你可以测测。
是按照组件顺序执行,每个step 之间有关联
4.2版本刚刚实测,A进B表,B表进C表的过程。与预期不符,C表进入的数据没有包含B表的数据。
认为存在缺陷或隐患。
建议保持在3~4步左右最好,多个步骤分多个transformation按照顺序执行。

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