Ppb
[化] 十亿分率
🗣️ 情景例句
Ah! Miss Stewart! Welcome!
嗨！ Stewart小姐！ 欢迎你！
I met her last Sunday.
我上个星期日遇见她。
I'm sorry, but I don't think this damage is our fault.
抱歉，不过我不认为这次的损坏是我们的错。