Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
OK, let's begin. To our friendship!
可以，开始吧，为了友谊！
I ate too much candy. I have a toothache.
我吃了太多的糖果。牙齿在痛哩。
We all know what the poor man should have said,
我们都明白那个可怜的人应该说些什么，