chéng / shì / lǐ / de / shēng / huó / wū / shuǐ / bì / xū / jīng / guò / chǔ / lǐ / cái / néng / pái / fàng

城市里的生活污水必须经过处理才能排放。

Domestic wastewater in cities must be treated before it can be discharged.