when 后面 接一般过去式或者单三式 接的都是一瞬间的动作
while 后面接 过去进行时 例如 was reading 等 都是延续性的动作
when 指“时点”“时段”
while 指“时段”
When I got there, they had left.
While(When) he was doing his homework, his brother was watching TV.
请及时采纳，不懂继续问(天天在线）。(*^__^*) 祝学习进步! 谢谢！
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