Ppbv
abbr. parts per billion by volume 十亿分体积比
🗣️ 情景例句
and Susan and Robbie to Jones Beach?
Susan、Robbie去Jones海滨的事吗？
I'm Barnard and it's my great honor to tell you about our new product.
我叫巴纳德，能够向你们说明我们的新产品，我感到非常荣幸。
easily obtainable from the lunar rocks in the form of liquid oxygen.
从月球上的岩石中很容易提炼出液态氧，