污水 wūshuǐ HSK5 sewage Definitions Defs Origin Strokes Stroke Words Sentences Sents 污水坑 wūshuǐkēng cesspit 污水处理厂 wūshuǐchǔlǐchǎng sewage plant water treatment plant污水管 wūshuǐguǎn sewer pipe sewage pipe生活污水 shēnghuówūshuǐ domestic sewage