名词
中文翻译：下水道
同义词：
['drain', 'septic tank', 'toilet']
例句：
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1. The sewer system is designed to carry wastewater away from the city.
下水道系统设计用来将废水从城市中排出。
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2. The sewer was clogged with debris and needed to be cleaned out.
下水道被堵塞了，需要清理。
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3. The sewer workers are responsible for maintaining the cleanliness of the city's waterways.
下水道工人负责维护城市的水道清洁。