Audible sound has a wavelength that can be up to 50 feet long.

人们能听到的声音的波长 可以达到50英尺。

And by using the interactions between ultrasound waves the display can even produce audible sound.

通过利用超声波之间的相互作用，显示器甚至可以产生可听见的声音。

And even if my tiny lungs could move enough air for an audible sound wave, my itty bitty vocal cords must be ringing at 20 kHz or higher.

即使我的迷你肺可以移动足够的空气，产生听得见的声波，我细小的声带一定是在20 kHz 或更高的频率震动。