举个例子给你,
这些是留学生,其中两个来自美国.
These are students abroad.Two of them are from USA.
These are students abroad,two of whom are from USA.
可以看到,用them的时候后面是一个完整得句子,可以独立存在.
用whom的时候就是一个定语从句,即后面的句子是来限定前面的students abroad,是不能单独存在得.
举个例子给你,
这些是留学生,其中两个来自美国.
These are students abroad.Two of them are from USA.
These are students abroad,two of whom are from USA.
可以看到,用them的时候后面是一个完整得句子,可以独立存在.
用whom的时候就是一个定语从句,即后面的句子是来限定前面的students abroad,是不能单独存在得.