治理(zhì lǐ) - to manage, to govern; to bring under control, to clean up (pollution) in Mandarin

政zhèng府fǔ花huā了le很hěn多duō钱qián治zhì理lǐ河hé流liú的de污wū染rǎn。

The government spent a great deal cleaning up river pollution.

这zhè个ge城chéng市shì的de空kōng气qì治zhì理lǐ得de很hěn好hǎo。

This city has done a good job of cleaning up its air.

治zhì理lǐ一yí个gè国guó家jiā不bú是shì一yí件jiàn容róng易yì的de事shì。

Governing a country is no easy task.

经jīng过guò几jǐ年nián的de治zhì理lǐ，湖hú水shuǐ又yòu干gān净jìng了le。

After several years of work the lake is clean again.

大dà家jiā要yào一yì起qǐ治zhì理lǐ小xiǎo区qū的de环huán境jìng。

Everyone needs to work together to improve the estate's surroundings.