Uf
abbr. 脲甲醛树脂；超声频率（Ultrasonic Frequency）
🗣️ 情景例句
2, 3 , 1, 2, 3, pony, pony... 2 3 1 2 3
小马步 小马步 ……
Sailboats glided motionlessly across the lake.
帆船静静地像滑动似的在湖上前进。
I'm glad that you could see me today.
真高兴你今天能来。