名词
中文翻译：下水道
同义词：
['drain', 'drainpipe', 'sewer pipe']
例句：
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1. The sewer system is responsible for removing wastewater from the city.
下水道系统负责从城市中去除废水。
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2. The sewer was clogged and caused a backup in the neighborhood.
下水道堵塞了，导致附近地区发生水淹。
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3. The sewer system needs regular maintenance to prevent blockages.
下水道系统需要定期维护，以防止堵塞。