名词
中文翻译：前云
同义词：
['frontal fog', 'frontal rain']
例句：
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1. The frontal cloud was so densethat it blocked out the sun.
前云如此密集以至于挡住了太阳。
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2. The frontal cloud moved slowly across the sky.
前云缓慢地在天空中移动。
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3. Frontal clouds are often associated with storms.
前云常常与暴风雨联系在一起。