Ppm.
[医] 兆比率(百万分之几)
🗣️ 情景例句
She has a very strong personality.
她个性坚强。
Better lose the saddle than the horse.
吃小亏占大便宜。
Good. Put it on the small table, please.
好，把箱子放在那个小桌子上吧！