Ppm.
[医] 兆比率(百万分之几)
🗣️ 情景例句
He's a lawyer, in Thessaloniki.
他是Thessaloniki的一名律师。
Kindness is the golden chain by which society is bound together.
善良是连结社会的金链。
'I must be at work at 10 o'clock.
“我必须在10点钟上班，我的雇主会证明我是按时到了那儿的。