They measured the radio frequency instead of optical frequency measurement with optical frequency comb and technology of octave-spanning.
利用光频梳和倍频技术,把对光频的测量变为对射频的测量,这样就能够很容易地测出光的频率。
2
Almost all musical systems are based on scales spanning an octave-the note that sounds the same as the one you started off with, but at a higher or lower pitch.
Almost all musical systems are based on scales spanning an octave-the note that sounds the same as the one you started off with, but at a higher or lower pitch.