When the alien was in the bookshop,I called my parents while Martin was looking for her bike,Rose saw him.
when和while汉语中都译为“当……时候”,用来引导时间状语从句.when后面既可以接延续性动词,也可以接短暂性动词；而while后面只能够接延续性动词.while常常强调“正当……时候”,侧重于“在……进行中”.
When the alien was in the bookshop,I called my parents while Martin was looking for her bike,Rose saw him.
when和while汉语中都译为“当……时候”,用来引导时间状语从句.when后面既可以接延续性动词,也可以接短暂性动词；而while后面只能够接延续性动词.while常常强调“正当……时候”,侧重于“在……进行中”.