名词
中文翻译：云的形成同义词
同义词：
['cloud formation', 'cloudy weather', 'cloud cover']
例句：
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1. The formation of clouds is a natural process that can be observed from the ground.
云的形成是一种可以从地面观察到的自然过程。
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2. The weather forecast predicted a cloudy day with scattered showers.
天气预报预测了一天多云，有零星的阵雨。
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3. The cloud formation was so dense that it blocked out the sun's light.
云层非常密集，以至于遮蔽了太阳的光芒。