Ppb
[化] 十亿分率
🗣️ 情景例句
I'll get some for you.
我去替你买一些。
Do business,but be not a slave to it.
要做事，但不要做事务的奴隶。
he realizes its volume, as the space that the shape displaces in the air.
他能意识到物体的体积，那就是它的形状在空气中所占的空间。