| 单词 | Doppler effect |
| 释义 | Doppler effect (once / 347627 pages) n WORD FAMILY Doppler effect USAGE EXAMPLESThe Doppler effect is the key to cosmology. explosions, that produced any particular sample of magnesium. Carl Sagan, Cosmos(1980) To understand the implications of this, we must first understand the Doppler effect. Stephen Hawking, A Brief History of Time: And Other...(1988) The Doppler effect is usually explained by the changing sound a police car siren makes as it approaches and passes the listener. BBC(Apr 15, 2016) n change in the apparent frequency of a wave as observer and source move toward or away from each other Syn|Hyper Doppler shift propagation the movement of a wave through a medium |
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