是要看主动还是被动的
主动
The man standing by the window is our teacher. = The man who is standing by the window is out teacher.
被动
I don't receive the e-mail sent by you. = I don't receive the e-mail which was sent by you.
若有疑问及时追问，满意敬请采纳，O(∩_∩)O谢谢~~
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