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位于空气中的声源S1和接收者S2,当它们与传播声波的介质——空气之间有相对运动时,接收者接收到的声音频率与声源所发出的频率往往不相等,这就是多普勒效应．
The sound sources S1 and S2 located in the air, when they move relative to the sound propagation medium—air, the frequency of the sound received by the receiver and the frequency emitted by the sound source are often not equal. Puller effect.