学校开了一次全校大会。

The school held a general assembly.

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在昨天的全校大会上，我们看了一个有关防火的电影。

At the school assembly yesterday we saw a film about fire prevention.

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校长在全校师生大会上讲话。

The headmaster told the school at assembly.

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校长在全校师生大会上讲话。

The headmaster told the school at assembly.

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