Naaqs
[医][=National Ambient Air Quality Standards]国家环境空气质量标准
🗣️ 情景例句
Seeing as you are all so tired, we'll finish this lesson next time.
考虑到现在你们都很累了，这课我们下次接着讲吧。
God! It's a hard stuff.
唔！这家伙是个硬骨头。
Where's Meimei?
梅梅在哪里？