飞机穿透厚厚的云层慢慢向下降落。

The plane nosed down through the thick clouds.

《牛津词典》

与漫天飞舞的雪相遇，又改道向下降落。

Meeting those meandering down they turn and descend again.

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当关井时，柱塞沿生产管柱向下降落。

When the well is shut-in, a plunger is dropped down the production string.

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