这条河经过多年治理，水质已经明显改善。

Zhè tiáo hé jīngguò duōnián zhìlǐ, shuǐzhì yǐjīng míngxiǎn gǎishàn.

After many years of treatment, the water quality of this river has clearly improved.

城市治理不仅需要好的规划，还需要市民的参与和配合。

Chéngshì zhìlǐ bùjǐn xūyào hǎo de guīhuà, hái xūyào shìmín de cānyù hé pèihé.

Urban governance not only needs good planning, but also requires citizens’ participation and cooperation.

政府正在采取措施治理空气污染。

Zhèngfǔ zhèngzài cǎiqǔ cuòshī zhìlǐ kōngqì wūrǎn.

The government is taking measures to control air pollution.