Udc
abbr. 国际十进位分类（universal decimal classification）
🗣️ 情景例句
There's always a friend around when you need one.
当你需要朋友帮忙的时候，总会有朋友在你身边的。
I ought to think about it.
我应该再三考虑。
His father told everybody that Eric had been killed in action.
他的父亲告诉大家，埃里克在战争中被打死了。