名词
中文翻译：云
同义词：
['fog', 'mist', 'fog bank', 'cumulus cloud']
例句：
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1. The sky was filled with clouds as the sun set.
太阳落山时，天空布满了云。
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2. The weather forecast said there would be a cloudy day tomorrow.
天气预报说明天会是个多云的日子。
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3. The clouds above us were moving slowly across the sky.
我们头顶上的云正在缓慢地移动过天空。