Zhè tiáo hé de shuǐzhì hěn chà, bù néng yǐnyòng.
The water quality of this river is very poor and it cannot be used for drinking.
Zhèngfǔ zhèngzài nǔlì gǎishàn chéngshì de shuǐzhì.
The government is working to improve the city's water quality.
Jiǎncè shuǐzhì shì bǎozhàng gōngzhòng jiànkāng de zhòngyào cuòshī.
Testing water quality is an important measure to protect public health.
