Uf
abbr. 脲甲醛树脂；超声频率（Ultrasonic Frequency）
🗣️ 情景例句
Great!
真棒！
What are you looking at?
你正在看什么？
The morning passed rapidly and Frank was about to leave when he noticed a large packing case lying on the floor.
上午很快过去了，弗兰克正准备离去，突然看见地板上放着一只体积很大的货箱。