Doppler effect
01
多普勒效应, 多普勒现象
the change in frequency or wavelength of a wave in relation to an observer who is moving relative to the source of the wave, producing a shift in pitch or color
例子
When a car with a honking horn drives by, the change in pitch you hear is due to the Doppler effect.
当一辆鸣笛的汽车驶过时，你听到的音高变化是由于多普勒效应。
