in the meantime, many problems have arisen, a manifest one of which is the shortage of fresh water.of which 是什么用法

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inthemeantime,manyproblemshavearisen,amanifestoneofwhichistheshortageoffreshwater.ofwhich是什么用法inthem

in the meantime, many problems have arisen, a manifest one of which is the shortage of fresh water.of which 是什么用法
in the meantime, many problems have arisen, a manifest one of which is the shortage of fresh water.
of which 是什么用法

in the meantime, many problems have arisen, a manifest one of which is the shortage of fresh water.of which 是什么用法
which 是前句中problems的主语补足语,因为没有连接词所以用of which