Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
Hi-tech companies needs many interns to work for them during the summer.
高科技公司在夏天需要许多见习生为其工作。
Excuse me for a moment, please.
对不起失陪一下。
Thus they lay on hard wooden boards, unable to stand up or move around.
这样，他们就躺在硬木板上，既不能站立起来，也不能活动。