Odu
[医][=optical density unit]光密度单位
🗣️ 情景例句
Some people are afraid of flying, which limits their options when traveling.
一些人十分害怕坐飞机，这也就限制了他们旅行时的选择了。
I don't know whether it will rain or not.
我不知道是否将下雨。
Don't nag me!
别在我面前唠叨！