Ppb
[化] 十亿分率
🗣️ 情景例句
I'm a senior here, so let me know if I can help you with anything.
我是大四的老生，有什么能帮忙的尽管说一声。
He who has a mind to beat his dog will easily find a stick.
有心打狗好找棍；欲加之罪，何患无辞。
That sounds a silly suggestion,
这听起来似乎是一种愚蠢的想法，