名词
中文翻译：烟灰
同义词：
['smoke dust', 'smokeresidue']
例句：
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1. The factoryis always emitting soot dustinto the air.
工厂总是向空气中排放烟灰。
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2. The old building has been coveredin soot dust from years of neglect.
这座旧建筑多年来一直被烟灰覆盖。
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3. The workers had to wear masks toavoid inhaling soot dust.
工人们不得不戴上口罩以避免吸入烟灰。