Ppb
[化] 十亿分率
🗣️ 情景例句
Where do you work?, What school do you go to?
“你在哪工作？”，“你在哪儿上学？”。
I am very happy that you have come all the way from the United States to visit our company.
您不远千里从美国来我公司访问，我们感到非常高兴。
Please be aware that this is a crucial issue to us.
请了解这一点对我们至关重要。