Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
What kind of advice are you looking for?
希望能得到什么建议？
A gloved cat catches no mice.
戴手套的猫抓不到老鼠。
Not that long ago!I'm not more than twenty-nine myself.
不，没有那么久。我自己现在还没29岁呢。