Udc
abbr. 国际十进位分类（universal decimal classification）
🗣️ 情景例句
Where do you go to school?
你去哪里上学？
Two dogs over one bone seldom agree.
两狗啃一骨，相持难服输。
Those planning a trip to remote areas, or intending to live in countries where drinking water is not readily available, should know about the various possible methods for making water safe.
那些计划去偏远地区旅行，或在饮用水不现成的国家居住的人，应该知道如何使水适于饮用的各种办法。