Uf
abbr. 脲甲醛树脂；超声频率（Ultrasonic Frequency）
🗣️ 情景例句
We have talked of you ofter.
我们经常谈到你。
Sloth is the key of poverty.
惰能致贫。
It has to be tall because it is like a giant block and tackle,
井架必须很高，因为它像一个巨型滑轮组。