2nd amelioration:based on the first stage,it possesses elastic force and buffers to some extent considerably by using integrated board.But there are still some problems about the deformation of boards.
2nd amelioration:based on the first stage,it possesses elastic force and buffers to some extent considerably by using integrated board.But there are still some problems about the deformation of boards.
第二代改良型：在第一代的基础上进行改良，采用二维实木集成地板，具备一定弹力缓冲作用和耐用性，但仍存在较大的变形问题。