名词短语
中文翻译：烟雾扩散
同义词：
['smoke diffusion', 'smoke spread', 'smoke dispersion']
例句：
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1. The smoke from the factory is spreading throughout the city.
工厂的烟雾正在整个城市蔓延。
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2. The smoke from the fire was so thick that it obscured the moonlight.
火灾产生的烟雾如此之浓，以至于遮住了月光。
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3. The smoke dispersed quickly after the firefighters arrived.
消防员到达后，烟雾很快就消散了。