Odu
[医][=optical density unit]光密度单位
🗣️ 情景例句
Oh, yeah.
噢， 对了。
But after one week and I still hadn't made a single sale, my heart was in my boots.
但过了一星期还没有做成一笔生意，我感到十分焦急。
How do you know?
你怎么知道？