Ppb
[化] 十亿分率
🗣️ 情景例句
How you all doing ?
你们大家怎么样？
Good morning, ladies and gentlemen. It's very satisfying to see so many of you here.
各位女士各位先生，早上好，在这里见到你们大家使人感到非常满意。
I'll go and look after the man, she said.
“我去照料那个人”，她说。