Udc
abbr. 国际十进位分类（universal decimal classification）
🗣️ 情景例句
Do you remember
你记得
What does she mean by canceling her performance?
她取消自己的演出是什么意思？
As Earth-dwellers, we always cherish the hope that we will be visited by little green men and that we will be able to communicate with them.
小绿人来拜访我们，而我们可以和他们交流。