Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
This winter has been a cold one.
目前来看，今年冬天算比较冷的。
He's a composer of folk ballads.I like his music a lot.
他是民谣歌曲作曲家，我很喜欢他的音乐。
I have the right to know.
我有权知道。