名词
中文翻译：云
同义词：
['fog', 'mist', 'vapor', 'fog bank', 'cumulus', 'cirrus']
例句：
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1. Theclouds are moving in quickly.
云正在快速移动。
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2. The weather forecast says it will bea cloudy day.
天气预报说今天会是多云的。
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3. The clouds were sothick that they blocked the sun.
云层非常厚，以至于挡住了太阳。