Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
I was deeply impressed by his speech.
他的演讲给我留下深刻的印象。
Do you intend to finish before you leave?
你在出去以前要把它做完吗？
We realized that they must have become unduly frightened by the rising flood,
我们意识到他们一定是被不断上涨的洪水吓坏了。