问题描述：
求助一个英语句子的语法分析
It (ground underfoot) absorbs most of the water it contains from rivers.
后面的 it contains from rivers 是什么语法现象?
It (ground underfoot) absorbs most of the water it contains from rivers.
后面的 it contains from rivers 是什么语法现象?
问题解答：
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