Ppm.

[医] 兆比率(百万分之几)

🗣️ 情景例句

Why not?
为什么不能？
To fly an airplane
驾驶飞机
There was also a great deal of machinery on display.
参展的还有很多机器，
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🔤 更多 P 开头的单词

pan-anglican
party liner
petroleum reserves
phosphonium salts
piston expansion engine
pluperfect tense
preemption claiman
probabilistically
全部 P 开头单词 ›