The Bohai Petroleum Sewer in Tanggu District, Tianjin is dredged and transformed into an independent sewer.

管道清洗：

污水井清掏

抽粪吸污：

管道改造

化粪池清理：

阴沟清理

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, Hua Wen Xihei, ' ' , Hei Ti,
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, Chinese fine black, ' ' , bold body,
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