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问题: English~~~~

He surprised the thief ,and they struggled.Both were bleeding from minor injuries by the time the thief escaped out of the window .
这句话中有 by the time 为什么要用were bleeding 我搞不大清楚了谢谢讲解一下

解答:

by the time 是用来说明时间的,“当那个贼穿过窗户逃跑时他们都流着血”