The Vibration and wave motion are basic states of material motion.
振动和波动是物质运动的基本形态。
The vibration in the air and in the other media travels as a wave motion.
空气及其他介质中的各种振动都是以波动的形式传播的。
A vibration source and a medium are needed to form a mechanical wave.
机械波的形成需要振源和介质。
First, sound is the vibration of air, and it is a kind of wave motion.
首先，声音是空气的振动，是波动的一种。
First, sound is the vibration of air, and it is a kind of wave motion.
首先，声音是空气的振动，是波动的一种。
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