无论是限制性还是非限制性定语从句，在先行词（即被修饰词）与关系代词或关系副词之间可以插入其他成分；非限制性定语从句要用逗号跟主句分开，而限制性定语从句则否。例如：
They had a dog called Black, which they like very much. 他们养了一条叫布莱克的狗，他们非常喜欢它。
I was the only person in my office who was invited. 我是办公室中唯一被邀请的人。
The man under the tree, who is my uncle, will take me to Beijing next week. 树下的那个男人是我的叔叔，下周将带我去北京。
I still remember the day five years ago when I joined the Party. 我依然记得五年前我入党的那一天。
as too old fo
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