by the time 与before 有何分别?

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by the time 与before 有何分别?
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by the time 与before 有何分别?
by the time 与before 有何分别?

by the time 与before 有何分别?
by the time:是到...的时候的意思
before:是以前的意思

by the time 是到某个特定的时刻。而before则是为某时间段之前。

He had left Chine by the time when he was 40 years old. He had left Chine before he was 40 years old By the time I got outside,