The two or three main areas of campus（校园的两个或三个主要方面）
However the assumption is frequently made that the water loss is balanced by infiltration (groundwater leakage into the sewage system through poor joints) or storm water which enters the sanitary sewer system through illicit connections (roof downspouts and road catchbasins) or through manhole openings
标签: the two or three main areas of campus 校园 主要 方面
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