Ppmv
abbr. parts per million by volume 百万分体积比
🗣️ 情景例句
Hello.
哈喽。
They have different hopes.
他们有各自不同的愿望。
They lived by hunting and by gathering roots, nuts and wild fruits.
他们靠狩猎和采集根茎、坚果和野果为生。