Ufs
(uf 的第三人称 -s形式) abbr. 脲甲醛树脂；超声频率（Ultrasonic Frequency）
🗣️ 情景例句
Don't stand on ceremony, make yourself at home.
别客气，随便吃。
It's certainly a big improvement over yestterday.
肯定比昨天大有好转。
Good idea.
好主意。