Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
Please go over the draft of the contract.
请再看一下草案吧。
All the figures tally with the projected total.
合计和预算的总额一致。
I'll call a taxi in case of need.
如果需要的话，我会叫出租车的。