Suddenly It Rained 突然下大雨
it rained suddenly
突然下起了雨
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
youdao
In the afternoon it rained suddenly.
下午天突然下雨了。
《新英汉大辞典》
It rained suddenly.
突然下起雨来。
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