in the meantime, many problems have arisen, a manifest one of which is the shortage of fresh water.
问题描述：
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
答
which 是前句中problems的主语补足语,因为没有连接词所以用of which我英语不太好，能不能再讲具体点如果有and作为连接词，后句可以表达为and a manifest one of them is the shortage of fresh water.建议你多看看语法书~~这是基本句型，做多了会有语感