Ppb
[化] 十亿分率
🗣️ 情景例句
I'm calling to know if it would be at all possible to cancel our reservation.
我打电话想知道我们的预约是否有可能取消。
Truth's best ornament is nakedness.
不加装饰是真理的最好的装饰。
Because I've just retired.I want to buy a small house in the country.
因为我刚退休。我想在乡下买幢小房子。