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when“当……时”，引导时间状语从句时，从句用于表示主句动作发生的特定时间。如：
When you think you know nothing, then you begin to know something.
当你以为自己一无所知的时候，你就是在开始知道一些事物了。
When truth is buried under the ground ，it grows, it chokes, it gathers such an explosive force that on the day it bursts out , it blows up everything with it.
当真理被埋在地下的时候，它在生长，它感到压抑，它蓄存着这么一种爆炸性力量，一旦冒出，它就会炸破一切！
The days get longer when spring comes. = When spring comes, the days get longer.
春天到来时，白天变得更长了。
when引导的从句的谓语动词可以是延续性的动词，可以是瞬时动词。并且when有时表示“就在那时”。例如：
When she came in, I stopped eating.
她进来时，我停止吃饭。
When I lived in the countryside, I used to carry some water for him.
当我住在农村时，我常常为他担水。
We were about to leave when he came in.
我们就要离开，就在那时他进来了。
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