污水倒灌 back flow of sewage; backing up of sewage 第 Ⅰ助词(用在整数的数词前,表示次序) auxiliary word for ordinal numbers 第二 the secondⅡ名词1.
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backing up of sewage
污水回填
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The charity said that overflow pipes which prevent sewage backing up into drains and houses in times of heavy rain are necessary in an emergency.
BBC: Charity warning over raw sewage discharge levels
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