All at once it began to rain heavily.

突然间下起大雨来了.

辞典例句

The clouds above us say that it will rain heavily soon.

头顶上的云层预示着一场大雨即将来临.

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No sooner had I gone home than it began to rain heavily.

我一回到家里,就开始下起飘泼大雨来.

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Soon it began to rain heavily.

不久雨就下大了.

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Soon It'started to rain heavily.

很快地开始下大雨了.

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We were about to leave there when it began to rain heavily and suddenly.

就在我们要离开时,天突然下起了大雨.

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Shortly after they started their walk home , though, it began to rain heavily.

不过就在启程返家没多久, 开始下起了大雨.

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