污水管

zhè shì yī tiáo dòng le de wū shuǐ guǎn

这是一条冻了的污水管。

This is a frozen waste pipe.

gōng chéng shí jiàn zhèng míng duō céng bù fáng gèng jiā lì yú wū shuǐ guǎn jiē fèng mì fēng fáng shuǐ xiào guǒ

工程实践证明，多层布防更加利于污水管接缝密封防水效果。

The construction practice shows that multi-level seal is more favorable to waterproof effects of sewer joints.