问题描述：
这道题中while 和as的区别
Studies have found that,while wet weather may make us feel down,it improves and sharpens our memory.为什么这里while不可以换成as或者though
Studies have found that,while wet weather may make us feel down,it improves and sharpens our memory.为什么这里while不可以换成as或者though
问题解答：
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