Ppm.
[医] 兆比率(百万分之几)
🗣️ 情景例句
If this doesn't make you happy, nothing will.
如果这个事情都不能使你高兴趣来的话，就没有其他的办法了。
He always takes pride in his work.He's very efficient.
他总是以他的工作而自豪，他是非常能干的。
She had told him to come straight in if ever she failed to open the door and to leave the bread on the kitchen table.
她曾告诉过面包师，如果她不去开门，他可直接进门，把面包放在厨房的桌上。