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1·Two men riding on motorcycles opened fire on him.

两个骑在摩托车上的人向他开了枪。《柯林斯英汉双解大词典》

2·Then without warning, the troops opened fire on the crowd.

接着，在没有警告的情况下，军队向人群开了火。《柯林斯英汉双解大词典》

3·Soldiers opened fire on a car which failed to stop at an army checkpoint.

士兵们向一辆没在军事检查站停下来的汽车开了火。《柯林斯英汉双解大词典》

4·Two policemen were killed when gunmen opened fire on their patrol vehicle.

当持枪歹徒对巡逻车开枪射击时，两名警察中弹身亡。《柯林斯英汉双解大词典》

5·One of the prisoners is a self-proclaimed racist who opened fire on a crowd four years ago.

其中一名囚犯恬不知耻地自称是种族主义者，他曾在四年前向人群开枪射击。《柯林斯英汉双解大词典》

6·Herbert was fighting a house fire on December 29,1995.

1995年12月29日，赫伯特当时在扑灭一场房屋火灾。

7·Herbert was fighting a house fire on December 29, 1995.

1995年12月29日，赫伯特当时在扑灭一场房屋火灾。

8·In the midst of the large, old, smoking hall burnt a great fire on the stone floor.

在古老的、烟熏的大厅中间，石头地板上燃着一堆旺火。

9·When it was nearly morning, some fishermen lit a fire on the shore about half a mile away.

快到早晨的时候，一些渔民在半英里外的岸边生火。

10·Shall I put the fire on?

我打开暖气好吗？《牛津词典》