问题描述：
一个句子~WHEN和WHILE得转换
Shen None discovered tea when he was boiling the drinking water over an open fire.这里面得WHEN能不能换成WHILE～为什么?
Shen None discovered tea when he was boiling the drinking water over an open fire.这里面得WHEN能不能换成WHILE～为什么?
问题解答：
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