they are the means by which a person announces many things about himself中为何要用by,去掉by行吗

they are the means by which a person announces many things about himself中为何要用by,去掉by行吗

题目
they are the means by which a person announces many things about himself中为何要用by,去掉by行吗
答案
这是一个定语从句.如果还原成原句是a person announces many things about himself by the means
by是用的意思
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