Then, more water, until the rivers came back.
然后有了更多的水，直到河流也回来了。
The waste water from cities is made clean and back into rivers.
城市的污水被净化后，再排放到河流里。
Waste water from a number of cities is now "cleaned" before flowing back into rivers.
现在，许多城市里的废水被净化后才让它流回河里。
Waste water from a number of cities is cleaned before flowing back into rivers.
许多城市里的废水被净化后才让它流回河里。
Waste water from a number of cities is cleaned before flowing back into rivers.
许多城市里的废水被净化后才让它流回河里。
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