本刊今年第二期发表《“四拓”之光》一文后,不少读者来信询问该底板情况,现解答如下:一、该底板主要优点是什么?1.该底板设计制造的理论依据是:充分利用底板的变形与恢复能力在击球瞬间与海绵、胶片和球共同作用,综合参预提高出球的速度与旋转,超越了我国传统底板主要依靠海绵、胶片与球的变形和恢复能 After the publication of the second issue of this year, “” four extension “Light” article, many readers asked for the bottom of the letter, the answer is as follows: First, the main advantages of the floor What is the theory of the floor design and manufacture? Basis is: make full use of the deformation and resilience of the floor in the batting moment with the sponge, film and the ball together, the comprehensive participation in improving the speed and rotation of the ball, beyond the traditional floor mainly rely on the sponge, film and ball deformation and recovery can