Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
I hope so.
我希望如此。
Sailboats glided motionlessly across the lake.
帆船静静地像滑动似的在湖上前进。
We're now going back to the studio.'
现在我们回到电视演播室。”