Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
Are you going to attend graduate school?
你想读研吗？
To carry game to the nest
把猎获物搬到巢里
Next Friday? Why, what's happening? I'm going away for the weekend.
下星期五？嗨，到底有什么事情？我要外出度周末。