Ppb
[化] 十亿分率
🗣️ 情景例句
OK. By the way, tell your wife she throws a successful party.
好。还有，请告诉你夫人，她办了一个很成功的宴会。
Excuse me I can't visit you.
对不起我不能拜访你。
but hauling it out of the water proved to be a serious problem.
可是把盘子捞出却是一个很大的难题。