Tom has been late for classes twice.

汤姆上课迟到两次了。

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Tom has been late for classes twice.

汤姆上课已经迟到两次了。

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It's not polite to be late for classes, meetings, or appointments.

上课、开会或者约会迟到是很不礼貌的。

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But this is so-called Dead Week at Stanford, in late May, when students are still attending classes, writing final papers and cramming for exams.

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