Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
Oh, poor baby.
噢， 可怜的小宝贝。
He didn't say anything as to where he would go.
关于他的去处他什么也没说。
On motorways you can, at least, travel fairly safely at high speeds,
在公路上还好，你至少能以相当快的速度安全地向前行。