辨与析] during,when, while
during后面接名词：I went to visit the Great Wall during the summer vacation.我暑假里去游览了长城。
when,while都意为“当…”，都引导时间状语从句。
when强调时间点，通常译为“当…”，例如：
When she came in, I was cooking. 她进来时，我正在做饭。
while强调时间段，通常译为“正当……”，例如：
While he was cooking, a friend of his came to see him. 当他正在做饭的时候，一个朋友来拜访他。
参考资料：
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