of which通常和分数数字百分数连用，就像(one) of them
eg. I bought some books yesterday, of which a half are in English.
=I bought some books yesterday, a half of which are in English.
表示“在他（们）当中”的意思
which 只是代指先行词所指的事物
eg. I bought some books yesterday, which are in English.这时说书是用英语写的，而不是说那些书中有多少是用英语写的
看定语部分缺什么，决定是用什么
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