Udc
abbr. 国际十进位分类（universal decimal classification）
🗣️ 情景例句
at the end of the semester.
就在这个学期结束的时候。
I've got four kids at home and no wife.
我有四个由我父兼母职的孩子。
At that time, gold was discovered in California and thousands of people rushed there to look for gold.
当时有人在加利福利亚发现了黄金，于是成千上万的人涌到那里去寻找金子