Ppm.
[医] 兆比率(百万分之几)
🗣️ 情景例句
I'm thinking of ordering 100 sets. But one problem-
我正考虑定购一百台，只是一个问题-
Would you hold the line, please, I will find out his number for you.
请你不要挂断，我替你找他的号码。
Thank you.
谢谢。