Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
Would you like to stay for dinner?
可以留下来吃饭吗？
War is the business of barbarians.
战争是野蛮人干的事。
The one on the black bike.
骑在那辆黑色的自行车上的男孩。