我们学生会的娱乐部组织了一次活动，每个班级要为此拍摄一部短片。

The entertainment department of our Student Union organizes an activity in which each class shoots a short movie.

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在班级进行一次劳动竞赛活动。

In the class on a Labour competitions.

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在班级进行一次劳动竞赛活动。

In the class on a Labour competitions.

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