Ppm.
[医] 兆比率(百万分之几)
🗣️ 情景例句
Where's my husband?
我丈夫怎么还没来？
After you think it over,please let me know what you decide.
在你考虑它以后，请让我知道你决定什么。
He can get up for about two hours each day, but you must keep the room warm.
他每天可以起来两个小时，但您必须保持房间温暖。