Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
Next time you are in town, drop me a line.
下次你在城里的时候给我写信吧。
It's a beautiful country with several chains of mountains.
这个国家很美，它有很多山脉。
Zhang Jun did best of all.
张军在三人中跳得最高。