頻率調制

frequency modulation

frequency / frequently / repetitious

frequency

rate / frequency

to lead / to command / rash / hasty / frank / straightforward / generally / usually

to transfer / to move (troops or cadres) / to investigate / to enquire into / accent / view / argument / key (in music) / mode (music) / tune / tone / melody

to harmonize / to reconcile / to blend / to suit well / to adjust / to regulate / to season (food) / to provoke / to incite

to modulate / modulation

system / to control / to regulate / variant of 製|制[zhi4]

to manufacture / to make