The principle is that the tank chassis can slide up easily by using the three glossy surface of the triangular prism. When the tank reaches the top of the triangular prism, that is, an edge of the top, the tank field is uneven and it is easy to get stuck on this stone pillar. Once the tank slides on this triangular prism, it can only go out with the help of its companions or by luck. Because the Mitsubishi column is about half a meter high and the tank is stuck on it, that is to say, the front or rear of the tank is supported by a very stable tripod. Although the supported tank is still half on the ground, it is unlikely to drag the other half off the support, especially when it is stuck on this post when retreating. Because most tank drive wheels are rear-mounted, even tracked tanks will lose power once they are stuck in the rear.