many of them 用于并列句中,many of whom用于定语从句中。例如：
There are 60 students in our class,and many of them are from China.(有and,属于并列句，因此用many of them。)
There are 60 students in our class, many of whom are from China.(没有and,说明是复合句，因此用many of whom来引导定语从句。)
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