refer to 参考,查阅;涉及,提到;指的是。
这里的意思是“提到的,涉及的。”
用法就是sb refer to sth/sb某人提到某物/某人,被动语态就是sb/sth is referred to (by sb)
实际上这个句子是定语从句的省略:
the professor (who is referred to) came yesterday.
(被谁)提到的那个教授昨天来了。
意思和下面这个例句差不多:
I have met the person you refered to, but I don't know his name.
你说的那个人我见过,但是我不知道他的名字。
所以把定语从句摘掉后这个句子就是the professor came yeterday.
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