So there is an electrical circuit into the card and when you open it, it moves a membrane and the membrane makes the music.

所以卡中有路，当你打开它时，它会移动薄膜，薄膜就会出音乐。

It functions in the circuit as a capacitor, and when radio waves pass through the antenna, the minuscule voltage shifts make the membrane bounce like a trampoline.

这种件路中起容器的作用，当无线波通过天线时，微小的位移压让薄膜像蹦床样弹起来。