= not later than +某时间(正式) = no later than +某时间(非正式) You'll have to finish all the workby five this afternoon. 你所有的工作最迟要在今天下午五点前完成。 By the time I arrived at the station, the train had left. 等到我到了车站时,火车已经开...
如:By the time you graduate,I shall have been working here for five years.到了你毕业时,我就在此地一直工作了五年之久。
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