Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
It's not your fault.
那不是你的错。
A moneyless man goes fast through the market.
一个没钱的人很快穿过市场。
In less than three months Chaplin acted in 11 films.
在不到3个月的时间里，卓别林就演了11部电影。