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
You can sit down now.
现在你可以坐下了。
Time tames the strongest grief.
时间可以冲淡最强烈的悲伤。
I could answer sixteen of the question.They were very easy.
其中的16道题。这些题很容易。