例如罗马人便修建了导水管,将清洁水引入城镇,并清除下水道污物.
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因为根据哈定上校所说, 下水道被德军少尉给监视著.
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Students who are experienced sewers can elect to construct a more difficult garment.
担任缝纫工作的学生可以选择制作更复杂的衣服.
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The soids would clog sewers, cause interference in subsequent treatment processes.
这些固体物将堵塞管渠, 影响后续处理.
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