This wave of excess density is sound.
这种过剩密度的波就是声波。
Detonation is propagation of a combustion-driven shock wave at or above the speed of sound.
爆轰是一种以冲击波为特征，以超音速传播的爆炸。
Sound is a form of wave energy that can travel through air.
声音其实就是声波，能在空气中行进的声波。
The frequency of the sound wave is controlled by the feedback signal of the system.
声光晶体由行波场驱动，声场频率则由系统的反馈讯号控制。
The propagation equation of sound wave in gas liquid mixtures is given.
文章给出声波在气液混合物中的传播方程。
The decline effect of fabric on sound wave has the chractaristic of frequency alternative.
织物对声波的衰减作用具有频率选择性。
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。
Thee frequency, wave length, and speed of sound are closely related.
声音的频率、波长和速度三者是密切相关的。
Thee frequency, wave length, and speed of sound are closely related.
声音的频率、波长和速度三者是密切相关的。
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