求大神解释一下ofwhichg和only4%为什么能互换？最好帮解释一下句子架构成分！谢谢！！
70% of the earth surface is covered with water, only 4% of which is fresh water. 70% of the earth surface is covered with water, of which only 4% is fresh water.
of which大概是可以忽略不计的吧 所以它放在哪里没关系 就是一个从句而已 考试应该不会考这么细吧 理解意思就行
70% of the earth surface（主语） is（谓语） covered with water（过去分词做后置定语 表被动）, only 4% of which is fresh water.（从句）
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