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1·My last class is over at 3:30.

我最后一节课是在三点半结束。

2·Class is over. Let's play balls.

下课咯，去玩球吧。

3·The class is over. You can go home now.

下课了，你们可以回家了。

4·Class is over.

下课。

5·Class is over. Let's take ten minutes' break.

下课了。让我们休息十分钟。

6·Class is over.

下课。

7·Class is over. It's time to clean the classroom.

下课了。是我们打扫教室的时候了。

8·Time is up. Class is over. That's all for today.

时间到了，下课了，今天就学到这儿。

9·Class is over, so the students ran out one by one.

下课了，同学们一个接一个跑出来。

10·Now, class is over, so they are not in the classroom.

现在是下课时间，所以他们不在教室里。