四个数字三中三多少组

简介：If you take a closer look, you will see that this foot crane is different from the ordinary small crane. It just has two more erected pillars, like a small door frame, with a bamboo pole inlaid in the middle. If you step on the stone slab at one end, the other end will push down hard. Smash it, release it and it will bounce up on its own.