Frequencies, how many times you go around, f is revolutions per second It's called the angle of velocity.

频率就是一秒转多少圈,因为 f 是每秒转过的圈数,这就是角速度

耶鲁公开课 - 基础物理课程节选

He brings his opening note, that F-sharp, in a beat early.

他把他的起始音,升F,提前一拍

耶鲁公开课 - 聆听音乐课程节选

There was an important change: regulation F.D. came in 2000.

一项重要的变革就是,2000年F.D.金融条例的建立

耶鲁公开课 - 金融市场课程节选