名词
中文翻译：云层
同义词：
['cloudy', 'overcast']
例句：
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1.The cloudward sky was shrouded in mist.
云层的上方被雾气笼罩。
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2.The clouds were moving across the sky, casting a shadow on the ground.
云正在天空中移动，给地面投下了阴影。
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3.The weather forecast said it would be cloudward today.
天气预报说今天将会是多云天气。