HSK 6
污水
wūshuǐ名
sewage
工厂处理污水后才能排放。
Gōng chǎng chǔ lǐ wū shuǐ hòu cái néng pái fàng.
The factory may discharge wastewater only after treatment.
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New in the HSK 3.0 word list at level 6.