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 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。
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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