Udf
abbr. 南非民主统一战线（United Democratic Front）；通用磁盘格式（Universal Disk Format）
🗣️ 情景例句
The teacher flunked him in geography.
老师给他的地理打不及格。
There's nothing to do because tomorrow is a holliday.
无所谓因为明天是假期。
Collecting, by occupying spare time so constructively, makes a person contented, with no time for boredom.
收藏活动通过富有建设性地利用业余时间使人感到心满意足，不再有无聊之日。