The forest was nearly out of control when suddenly it rained heavily and saved the day.
森林大火几乎控制不住，但突然下起大雨，转危为安。
As I was going down the street, it suddenly rained, heavily.
我正走在街上，突然下起了大雨。
The students were enjoying themselves in the park when it rained suddenly.
学生们正在公园里玩时，突然下起了雨。
Suddenly, it rained again, we had to run away to find a place to take a break.
突然，又下雨了，我们不得不跑，找个地方休息一下。
Suddenly, it rained again, we had to run away to find a place to take a break.
突然，又下雨了，我们不得不跑，找个地方休息一下。
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