System and method for multistage frame rate conversion. In operation, the perforating system is disposed in the wellbore and used to form perforations in the wellbore. The smart card may include a random number generator and an encryption module. Moreover, if selectively removing the dielectric films around the recessed silicon surface, the sides as well as the surface of the recessed channel is exposed. The front end of the guide bump has a guide plane for guiding the hook to turn, so that when the hook is turned back to resume its original position, the hook presses precisely at the rear end of the guide bump to limit the inner rail from sliding into the middle rail.