Uf
abbr. 脲甲醛树脂；超声频率（Ultrasonic Frequency）
🗣️ 情景例句
In fact, that is the reason why I'm here to see you.
事实上 这是我来见你的原因。
One swallow does not make a summer.
一燕不成夏。
This rabbit had no natural enemies in the Antipodes,
这种兔子在澳大利亚及新西兰没有天敌，