回声现象就是在房间中，声源停止发声后，声音仍然持续的现象。
Reverberation is the persistence of sound in a room after the source has stopped making sound.
轮胎作为现代汽车的主要噪声源之一，其胎面振动被认为是主要发声机理之一。
One of major noise sources of modern automobile is tire whose vibration is considered a main cause of noise.
轮胎作为现代汽车的主要噪声源之一，其胎面振动被认为是主要发声机理之一。
One of major noise sources of modern automobile is tire whose vibration is considered a main cause of noise.
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