Concerns about public health led to the construction between 1876 and 1904 of three separate sewer systems to serve metropolitan Boston.
出于对公众健康的担忧，1876年至1904年期间，为了服务于波士顿市区，政府修建了三个独立的下水道系统。
The discharges from separate storm sewer systems in the dry weather do great harm to receiving water in Shanghai.
分流制雨水系统旱流放江严重污染了上海市河道水质。
The discharges from separate storm sewer systems in the dry weather do great harm to receiving water in Shanghai.
分流制雨水系统旱流放江严重污染了上海市河道水质。
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