Sewage______(treat)is a big problem in many big cities.根据句子意思,用所给词的适当形式填空

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Sewage______(treat)isabigprobleminmanybigcities.根据句子意思,用所给词的适当形式填空Sewage______(treat)isabigproblemin

Sewage______(treat)is a big problem in many big cities.根据句子意思,用所给词的适当形式填空
Sewage______(treat)is a big problem in many big cities.
根据句子意思,用所给词的适当形式填空

Sewage______(treat)is a big problem in many big cities.根据句子意思,用所给词的适当形式填空
treatment (污水)治理,处理

我认为填treatment,sewage treatment译为废水/污水处理