shì zhèng bù mén / zhèng zài / gēng huàn / lǎo jiù / de / wū shuǐ guǎn / yǐ / jiǎn shǎo / chéng shì / nèi lào市政部门正在更换老旧的污水管,以减少城市内涝。The municipal department is replacing old sewage pipes to reduce urban flooding.