名词
中文翻译：Unknown
同义词：
['submerged manhole', 'sunken pipe', 'sunken drain']
例句：
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1. The sunken manhole was filled with water after the storm.
暴风雨过后，这个沉没的下水道盖被水填满了。
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2. The workers had to dig out the sunken manhole to fix the broken sewer line.
工人们不得不挖出沉没的下水道盖来修理断裂的污水管。
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3. The sunken manhole was a hazard for pedestrians and vehicles.
沉没的下水道盖对行人和车辆构成了危险。