他们开始回到基地，一个连接到他们发现约翰的地方和许多下水道、地下室的地下设施。
They were making their way back to base camp, an underground facility that connected to many of the sewers, as well as many basements, including that of which they found John in.
反冲洗水排放到下水道或者沉淀，沉淀上清夜回到水厂前区且泥以某种可以接受的方式处理。
Backwash water is either discharged to the sew or settled with the supernatant return to the front of the plant and the sludge treated in some acceptable manner.
反冲洗水排放到下水道或者沉淀，沉淀上清夜回到水厂前区且泥以某种可以接受的方式处理。
Backwash water is either discharged to the sew or settled with the supernatant return to the front of the plant and the sludge treated in some acceptable manner.
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