which

1. Here are the designs. Which one(s) do you prefer?
   这就是那些图样. 你喜欢哪一个[些]?
2. Here are the chairs. Tell me which are worth buying.
   就是这些椅子。告诉我买哪几把好。
3. Which book have you read?
   哪一本书你读过了？
4. I want to take away the book which you showed me yesterday.
   我想带走你昨天给我看的那本书。
5. He lost his way, which delayed him considerably.
   他迷了路，这使他耽搁了很久。

which

pron.（代词）
What particular one or ones:
哪一个，哪一些：特定的一个或那些：
例句：
Which of these is yoursô
这些里面哪个是你的ô

The one or ones previously mentioned or implied, specifically:
那一个，那一些：先前提到的或暗指的那个或那些，尤其是：
Used as a relative pronoun in a clause that provides additional information about the antecedent:
在从句中用作关系代词为其先行词提供额外附加信息：
例句：
my house, which is small and old.
我的房子，又小又旧

Used as a relative pronoun preceded bythat or a preposition in a clause that defines or restricts the antecedent:
用在前面带有that 或一介词的从句中作关系代词，定语从句用以给先行词下定义或做限制：
例句：
that which he needed; the subject on which she spoke.
那他所需要的；她谈到的话题

Used instead ofthat as a relative pronoun in a clause that defines or restricts the antecedent:
用以取代that 在从句中作关系代词，该从句限制或给其先行词下定义：
例句：
The movie which was shown later was better.
后来上映的电影较好看

Any of the things, events, or people designated or implied; whichever:
任一：任一个规定或暗示的事、事情、人；任一：
例句：
Choose which you like best.
选你最喜欢的

A thing or circumstance that:
那事情，那情况：
例句：
He left early, which was wise.
他早早地离开，那是很明智的

adj.（形容词）
What particular one or ones of a number of things or people:
…那个：一定数目的人或物中特定的一个或一些：
例句：
Which part of town do you meanô
你是说城镇的哪个地区ô

Any one or any number of; whichever:
任一个，任一些；无论哪个：
例句：
Use which door you please.
随便你用哪个门

Being the one or ones previously mentioned or implied:
…的那个：先前提及或暗指的那个：
例句：
It started to rain, at which point we ran.
天开始下雨时，我们跑了起来

来源：
Middle English
中古英语
from Old English hwilc * see k wo-
源自 古英语 hwilc *参见 k wo-

The antecedent ofwhich can sometimes be a sentence or clause, as opposed to a noun phrase,as inShe ignored him, which proved to be unwise. They swept the council elections,which could never have happened under the old rules. Such examples are unexceptionable,but care should be taken that this usage does not cause ambiguities.The sentenceIt emerged that Edna made the complaint, which surprised everybody may mean either that the complaint was surprising or that it was surprising that Edna made it. The ambiguity can be avoided with paraphrases such asIt emerged that Edna made the complaint, a revelation that surprised everybody. ô In its use to refer to the contents of sentences and clauses,which should be used only when it is preceded by its antecedent. When the antecedent follows,what should be used, particularly in formal style: Still, he has not said he will withdraw, which is more surprising but Still, what (not which ) is more surprising, he has not said he will withdraw. See Usage Note at that ,what ,whose
which 的先行词有时可为一个句子或一个从句， 与名词短语相对立，如在句子她忽视了他，结果证明这是不明智的。 他们在委员会选举中一举获胜，这在旧体制下是永远不会发生的。 这样的例子是无懈可击的，但应该小心谨慎以使这种用法不致于引起模棱两可。句子It emerged that Edna made the complaint, which surprised everybody（埃德娜发出了使每个人都很吃惊的怨言） 既可以指怨气让人吃惊也可以指抱怨的是埃德娜而让人吃惊。 用例如It emerged that Edna made the complaint, a revelation that surprised everybody.（埃德娜大加抱怨，这发现让大家都很吃惊） 这样的句子就可以避免模棱两可。 在它被用来指句子或从句内容时，which 只用在先行词在其前面时。 当先行词跟在后面时，就应该用what ，特别是在正式文体中： Still, he has not said he will withdraw, which is more surprising（他依然还是没说他将退出，这更让人吃惊） 但另外一种形式 Still, what （不用 which ) is more surprising, he has not said he will withdraw.（然而，更让人吃惊的是他还是没说他将退出） 参见 that,what,whose