求翻译：硬度，指材料抵抗刚体压人表面的能力。对于底板 floor来说，主要指受冲击区域的局部变形。底板 floor硬度大，击球受压后表面变形小，吃球浅，持球时间短，不利于制造摩擦和加转。反之表面变形大，吃球深，持球时间长，有利于摩擦和加转是什么意思？

Hardness of a material to resist the ability of the surface of the rigid body pressure. For backplane floor, mainly referring to by the local deformation of the impacted area. The bottom floor hardness, batting compression of the surface deformation is small and light to eat the ball, the ball a sho

The material hardness, resistance rigid surface pressure. The bottom plate for floor, primarily refers to the impact area of a local deformation. Large floor plate hardness, after hitting the surface pressure, eat small ball shape, and short time ball manufacturing, to the detriment of the friction

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Hardness, material against the human capacity of the surfaces of rigid body. For the bottom floor is mainly refers to the local deformation of the impact zone. Baseboard floor hardness, batting after compression of surface deformation of small, eat ball light, short ball, is not conducive to create

Degree of hardness, refers to the material resistance rigid body to oppress others superficial ability.Regarding ledger wall floor, mainly refers is attacked the region the local distortion.The ledger wall floor degree of hardness is big, after hits a ball the bearing the areal deformation to be sma