夜幕低垂，云层密布，下着滂沱大雨，整个天空仿佛是一座巨大的水闸似地。

The evening approached, the clouds gathered, the rain poured down, as if all the sky was nothing but a vast flood-gate;

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正当我们准备启程的时候，天空下着滂沱大雨，因此我们必须取消郊游的计划了。

The moment when we were about to take off, it was raining cats and dogs, so we had tox out the plan of the picnic.

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