Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
Couldn't you sell us one carton for-?
不能以每盒--卖给我们吗？
Equivocation is first cousin to a lie.
支支吾吾，其言必诈。
Han Meimei, please look after the twins today.
韩梅梅，今天请照顾两姐妹。