Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
We'll do it!
我们就来进行吧！
Is it short way from here to the American Embassy?
从这里到美国大使馆要走一小段路。
Susan is going to finish college.
苏珊将完成大学学业。