A:这两个词都可用作从属连词,表示时间,意思都是"当(在)......的时候",但两者之间有区别: when 的含义是at or during the time that,既可用于一点时间(从句的谓语动词需用终止性动词),也可用于一段时间(从句的动词用延续性动词),从句与主句里面的谓语动词所表示的动作或状态能同时发生或一先一后分别发生。例如: He wants to help people when they are ill.他想在人们生病时帮助他们。 When he got to Shanghai,the ship had already set off.他到达上海时,轮船已经开走了。 while 的含义是during the...
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