名词
中文翻译：Unknown
同义词：
['高烟雾浓度、浓烟密度、高密度烟雾']
例句：
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1.The firefighters were called to the scene of the high smoke density.
消防员被召到高烟雾密度的现场。
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2.The dense fog made it difficult for the pilots to see clearly.
浓雾使飞行员难以清晰地看到。
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3. The air quality was so poor that people had to wear masks in the high smoke density area.
空气质量极差，人们在高烟雾密度区域不得不佩戴口罩。