在这些城市，雨水和生活污水由相同的排水系统排放，意味着当下水道水量过大，未经处理的污水会直接涌向河流和溪流。
These cities collect stormwater and sewage in the same pipes, which means that when sewers are overwhelmed, raw sewage floods directly into rivers and streams.
由于园内水体原有的排水系统缺少循环，加之长期受周边生活污水的污染，湖中的植物和鱼类越来越少。
The lack of cycling of the former drainage system in the Park, and the prolonged pollution from the surrounding household sewage, the lake in the park saw less and less flora and fish.
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