名词
中文翻译：灰尘
同义词：
['ash', 'slag', 'grit']
例句：
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1. The old house was covered in dust and cobwebs.
这所旧房子满是灰尘和蜘蛛网。
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2. The car was covered in dust from the long journey.
汽车在长途旅行后满是灰尘。
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3. The old books were covered in dust and needed to be cleaned.
这些旧书满是灰尘，需要清理。