Learner's definition of SUCH
1
always used before a noun —
used to say that something is great in degree, quality, or number如此的 -
I've been such a fool! [=I've been very foolish]我竟然如此愚蠢！
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How could you believe such nonsense?你怎么能相信这样的鬼话？
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I've never seen such a (large) crowd here before.我以前从没见过这么多人在这儿。
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Where are you off to in such a rush?你这么匆忙地去哪儿？
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The building had deteriorated to such a degree [=so much] that they had to tear it down.这座建筑已经破败成这个模样，他们不得不进行了拆除。
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I was surprised that the town had changed to such an extent. [=so much]这个镇子变化如此之大，让我大吃一惊。
2
not used before a noun —
used to say that something has a quality that results in something specified如此（…以致） -
The evidence is such as to leave no doubt of his guilt. = The evidence is such that there can be no doubt of his guilt.证据非常充分，毫无疑问他有罪。
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Her excitement was such that she could hardly contain herself. [=she was so excited that she could hardly contain herself]她兴奋得几乎无法自持。
3
always used before a noun : of the kind specified这种的；这样的；那种的；那样的 -
The gun had his fingerprints on it. Such evidence [=evidence of that kind] leaves little doubt of his guilt.枪上留有他的指纹，这种证据几乎可以确定他有罪。
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She has published her first sci-fi novel and hopes to write more such novels.她出版了她的第一部科幻小说，并且希望创作更多此类小说。
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No such agreement was made.没有达成任何这样的协议。
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I know it was an accident, but such people [=people like that] should not be allowed to drive.我知道那是一起意外事故，但是真不应该让那样的人开车。
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“Can I talk to Mary?” “I'm sorry. There is no such person here.” [=there is no one named Mary here]“我可以和玛丽说话吗？”“对不起，这里没有这个人。”
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In such a situation (as this), it is important to remain calm.在这种情况下，重要的是要保持冷静。
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The magazine publishes articles about such varied subjects as astronomy, politics, and gardening.这份杂志刊登有关诸如天文学、政治学、园艺等不同题材的文章。
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It will be documented in such a way/manner as to prevent misunderstanding. = It will be documented in such a way/manner that there can be no misunderstanding. [=it will be documented in a way that prevents misunderstanding]这件事将以一种能够避免误解的方式记录下来。
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I've never heard of such a thing!我从来没听说过这种事情！
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“You will apologize at once!” “I'll do no such thing!” [=I will not apologize]“你要立即道歉！”“我决不会道歉！”
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There is no such thing as having too many friends. [=you cannot have too many friends]朋友多多益善。
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She said she was too busy or some such nonsense. [=or something similar]她说她太忙了或者其他类似的胡话。
2 such /ˈsʌtʃ/ pronoun
Learner's definition of SUCH
somewhat formal
1
: that kind or type of person or thing这种人（或事物） -
She has a plan, if it may be called such. [=if it deserves to be called a plan; if it is good/practical enough to be referred to as a plan]她有一个计划，如果可以被称为计划的话。
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He was not only a politician but also an inventor and well-known as such. [=well-known as an inventor]他不只是政治家，还是发明家，且后者的名声还不小。
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It is a serious problem and should be treated as such.这是个严肃的问题，应该严肃对待。
— see also as such (below) 2
: something previously stated or specified（上文提到的）那样的情况，那件事，那样东西 -
If such is the decision, nothing further should be done.如果是那样决定的话，就不需要再做什么了。
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We were outnumbered and surrounded. Such being the case [=since that was the case], we had to surrender.我们寡不敌众，而且身陷重围。事已至此，我们不得不投降。
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If you retained a receipt, please enclose a copy of such. [=please enclose a copy of the receipt]如果你留有收据，请附上收据副本。
and such
: and things of that kind等等；诸如此类
as such
1
: of the usual or expected kind : in the usual sense在通常意义上的 2
: by, of, or in itself —
used to indicate that something is being considered by itself and not along with other things本身 — see also 2such 1 (above)
such is life
: life is like that and cannot be changed这就是人生，没法改变 3 such /ˈsʌtʃ/ adverb
Learner's definition of SUCH
1
somewhat informal —
used to make a description more forceful这么，如此（用于加强叙述语气） -
The team has such tall players. [=the team's players are very tall]这个队的队员个头这么高。
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She wears such stylish clothes. [=her clothes are very stylish]她的穿着这么时髦。
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She hasn't been in such good spirits lately.她最近难得有如此高昂的精神状态。
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We had such a good time [=a very good time] at the party!我们在这次聚会上度过了非常愉快的时光！
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It is such a long trip.这是一次十分漫长的旅程。
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It was such an awkward moment.这是个十分尴尬的时刻。
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Today was such a nice/beautiful day!今天是如此美好的一天！
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I don't think that's such a good/great idea. [=I don't think that's a good idea]我认为那不是个好主意。
2
: to the degree that is specified or understood（程度上）这样地，如此 -
Such violent movies (as these) are not suitable for children.像这样的暴力影片不适合儿童观看。
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We've never had such a cold winter (as this).我们从未经历过（像现在）这么寒冷的冬天。
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I have never seen such a large cat!我从未见过如此大的猫！
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I had such a bad headache that I couldn't think straight.我头痛欲裂，根本无法有条理地思考。
such as
1
—
used to introduce an example or series of examples例如，比如（用于引出一个或一系列例子） -
You will need some form of identification, such as [=like] a driver's license.你会需要个身份证明，例如驾照。
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“I have my reasons for not wanting to go.” “Such as?” [=give me an example]“我自有不想去的理由。”“比如呢？”
2
: of the specified kind像…样的；诸如此类的 -
In cases such as [=like] this (one), it's best to be cautious.像这样的情况，最好谨慎处理。
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Questions such as the one you've asked are difficult to answer.像你问的那种问题很难回答。
such as it is
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used to say that something is not very good in quality or condition尽管不怎么好；尽管质量不高；尽管不怎么样 -
The meal, such as it was, was served quickly. [=the meal, which was not very good, was served quickly]尽管这顿饭很一般，但是上菜速度快。
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Welcome to my humble home—such as it is.欢迎光临寒舍——尽管敝舍简陋。