Doppler Effect: refers to the phenomenon that the observer feels that the frequency changes when the wave source and the observer move relative to each other. When the wave moves from the wave source to the observer, the receiving frequency becomes higher, and when the wave source moves away from the observer, the receiving frequency becomes lower. According to the above definition, which of the following phenomena does not belong to the Doppler Effect? ['Experienced soldiers can judge whether the flying cannonball is approaching or distant from the sound of the cannonball flight.', 'The speed of motion of distant celestial bodies relative to the earth can be determined by the frequency of light waves emitted by distant celestial bodies received from the earth.', 'A monitor equipped with a speedometer transmits ultrasonic waves of a known frequency to the moving vehicle, and at the same time measures the frequency of the reflected wave, and the speed of the vehicle can be known according to the frequency change of the reflected wave.', "The alcohol detector is used to detect whether the driver drinks alcohol. When the alcohol concentration in the driver's mouth is too high, the diffusion speed is faster, and the light wave emitted by the detector can be detected."]