名词
中文翻译：污泥覆盖物
同义词：
['sludge cover', 'sludge blanket', 'sludge mat', 'sludge matting']
例句：
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1. The city's sewage treatment plant is responsible for cleaning up the city's sludge blanket.
城市的污水处理厂负责清理城市的污泥覆盖物。
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2.The construction crew had to remove the sludge blanket before they could start work on the new road.
施工队伍在开始新路建设之前必须清除污泥覆盖物。
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3.The sludge blanket was so thick that it was difficult to see through it.
污泥覆盖物太厚了，难以透过它看到里面的情况。