Rumble, rumble... A light yellow small car drove at a slow speed on the mountain grassland with no way out. The entire patch of short grass is as densely covered as the skin of a mountain. It is pure green except for a striking yellow dot, which is the only car. The car has passed the top of the mountain. The left window was open, and a white foot was straddling it, swinging against the door with the same leisurely frequency as the car. The wheels turned, making the soil entangled with grass roots make a firm, tight, and thorny sound. The old engine kept gasping for breath and chirping.