Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
and I'd like your opinion about it.
我需要你的意见。
He's an American.
他是美国人。
They were taking a badly damaged boat from the Virgin Islands to Miami to have it repaired.
他们驾着一条严重损坏的小船从维尔京群岛阿密修理。