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限定性关系从句用来确定我们指的是哪个人/物，且不使用逗号。非限定性关系从句添加额外信息（用逗号隔开），并且不能使用 "that"。
My mother, that is a nurse, works nights.
My mother, who is a nurse, works nights. — 在非限定性关系从句中绝不要使用 "that"。
The book, that I read, was great.
The book that I read was great. — 不要在限定性关系从句周围使用逗号。
The car that I bought is fast.
London, which is the capital of the UK, is huge.