The summer after 7th grade, students spend three weeks on a college campus studying advanced math for seven hours a day.

七年级后的那个夏天，学生们要在大学校园里待上三周，每天学习七个小时的高等数学。

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Cooke's four companies of guards there held out for seven hours against the fury of an army.

库克的四连近卫军，在一军人马猛攻之下，坚持了七个钟头。

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Tests showed that the catalyst remains active for seven hours before it becomes choked up with solid carbon.

测试表明，这种催化剂若没有被碳消耗则7小时后仍具有活性。

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They chose Andrea. Dr.Fay,operating for seven hours, was able to save Andrea's eyelid, eye muscles and socket.

VOA: standard.2010.06.30

If you don't give me seven hours a week, I don't know what I can do for you.

如果你们一周不学习7个小时，我不知道我能为你们做什么了。

麻省理工公开课 - 固态化学导论课程节选

Shot in the arm, Davis ran and hid in the forest for seven hours.

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Motorist Ryan Murray was stuck for seven hours on the M6 in Lancashire as he made his way from Aberdeen.

BBC: M6 snow leaves drivers stranded

Amla batted for seven hours and struck 20 fours before being run out as the tourists reached a total of 540.

BBC: Amla ton piles pressure on India