另外一种定语从句是非限定性定语从句。非限定性定语从句包含附加的信息,去掉从句部分对主句的含义和结构不构成影响。非限定性定语从句的关系词可以为which,whose,who和whom。但不可以使用that来连接非限定性定语从句,例如:
A list of contents would have made it easier to steer through the book, which also lacks a map.
一个目录列表使得概览这本书更容易,但这本书仍然缺少一个示意图。
She held out her hand, which Rob shook.
她伸出了手,这只手之前被罗伯摇动过。
Note that a non-restrictive clause is preceded by a comma (so as to set off the extra information), whereas no comma should precede a restrictive clause (indicating that the information is essential, not extra):
注意,非限定性定语从句之前有一个逗号(从而引出附加的信息),而限制性从句前没有逗号(说明从句信息是重要的,且不可以省略):
I bought a new dress, which I will be wearing to Jo's party. [non-restrictive]
我买了一条新裙子,我将穿着它参加乔的派对。[非限定性定语从句]
I was wearing the dress that I bought to wear to Jo's party. [restrictive]
我买了一条新裙子并将穿着它参加乔的派对。[限定性定语从句]
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