Udc
abbr. 国际十进位分类（universal decimal classification）
🗣️ 情景例句
I estimate his age to be about 30.
我估计他的年龄大约30岁。
My brother took lessons on the trumpet for nearly ten years.
我的兄弟有将近10年的时间听小号的课了。
I think it's closed.
我想已经关门了吧。