质量

zhè lǐ de fàn cài zhì liàng zuì jìn xià jiàng le

这里的饭菜质量最近下降了。

The quality of the food here has dropped recently.

wǒ men xiǎng zǔ zhǐ gōng gòng fú wù zhì liàng xià huá de jú miàn

我们想阻止公共服务质量下滑的局面。

We want to stop the slippage of the quality of public services.

zú gòu de shuì mián shí jiān shì xué xí zhì liàng de bǎo zhèng

足够的睡眠时间是学习质量的保证。

Enough time for sleep is the guarantee for the quality of learning.

xiāng duì zhì liàng

相对质量

relativistic mass

yuán zǐ de zhì liàng

原子的质量

atomic mass

zhè zhǒng lì zǐ zhì liàng hěn xiǎo

这种粒子质量很小。

This particle has a very small mass.