Udc
abbr. 国际十进位分类（universal decimal classification）
🗣️ 情景例句
My parents will think it's a good idea.
我的父母会觉得这是件好事。
You messed up!
你搞砸了啦！
Make sure that all bottles are opened in your presence,
确保瓶子是当着你的面开启的，