Again, if you stare at that video, there's not too much you'll be able to see, but once we magnify the motions 100 times, we can see all the motions and ripples in the neck that are involved in producing the sound.
Y si miran fijamente el video no hay mucho que puedan ver, pero al magnificarlo 100 veces, vemos los movimientos y ondulaciones involucrados del cuello al producir sonido.