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by the time
01
到...的时候
used to indicate a point in time before which an action or event has occurred or will occur
例子
He hopes to have traveled to at least 20 countries by the time he turns 30.
By the time they reached the theater, the movie had already started.
By the time the concert ends, it will be midnight.
By the time she finishes her degree, she will have learned a lot.
They will have cleaned up their act by the time the big inspection rolls around next month.
