Uin
abbr. 通用国际互联网号码（Universal Internet Number）
🗣️ 情景例句
I am unfamiliar with law.
我对法律不熟悉。
Do you know when he will be back?
你知道他什么时候会回来？
Before you leave the lab, make sure the electricity is turned off and the windows are shut.
你们离开实验室前，务必要关上电源，关好窗户。