Problem sets were assigned approximately once every week, and were typically due one week later.

问题方案大约每个星期分配一次，在一周需要交具有代表性的问题。

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Problem sets should be returned on the due date (usually a week later).

要按时上交(一般是一周后)。

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Problem sets should be returned on the due date (usually a week later).

要按时上交(一般是一周后)。

youdao