Uf
abbr. 脲甲醛树脂；超声频率（Ultrasonic Frequency）
🗣️ 情景例句
We want to leave on May 1st and return on May 8th.
我想五月一日走，五月八日回来。
The mailman is delivering letters.
邮差在发信。
We're sorry, but we cannot allow your claim.
对不起，我无法接受你的赔偿要求。