He revealed hidden pipes that discharged black effluent from local factories into the river, which flows into Lake Tai.
他揭露出了隐藏的管道，从当地工厂向河水泻出黑色污水并且流向太湖。
Effluent from the primary treatment slowly flows through a shallow artificial stream.
从初级处理的污水缓缓流过浅的人工流。
Effluent from the primary treatment slowly flows through a shallow artificial stream.
从初级处理的污水缓缓流过浅的人工流。
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