定语从句有限制性定语从句和非限制性定语从句两种。限制性定语从句是先行词不可缺少的部分。去掉它,主句意思往往不明确,与先行词之间不能用逗号分开。非限制性定语从句是先行词的附加说明,去掉了也不会影响主句的意思,它与主句之间通常用逗号分开。非限制性定语从句常常单独翻 Attributive clause with restrictive attributive clause and non-restrictive attributive clause two. Restrictive attributive clause is an indispensable part of the antecedent. Remove it, the main sentence meaning is often not clear, can not be separated from the antecedent with a comma. Non-limiting attributive clause is an ancillary explanation of an antecedent, removed will not affect the meaning of the main clause, it is usually separated by commas with the main clause. Non-limiting attributive clauses are often flipped alone