请物理学和英语高手帮忙翻译一段东西，如果满意，会有一项有丰厚报酬的论文交给你翻译

来源：百度知道 编辑：UC知道 时间：2024/06/02 10:58:42
球拍的作用力F来自正压力(N)和摩擦力(f)。正压力主要影响乒乓球回球速度(质心速度)；摩擦力主要影响转速。当球拍作用力相同时(F = F’)，为增加旋转而加大力臂l’ > l，必然以减少正压力为代价N’ < N。而提高摩擦力(图4)，这在乒乓球运动中称作“增强切球”(或称削球)。即，切的越薄(正压力越小)，旋转越快，但这会出现二个危险：其一，回球速度小(质心速度)，球不能过网；其二，出现打滑，使球脱落。
谢谢你，翻译的不错。不过，还有没有更地道一些的呢？

the force F of racket comes from the pressure (N) and friction (f). The positive pressure mainly affect table tennis ball back speed (the speed of center of mass); friction maily affect the rotational speed. When the racket forces are the same(F = F '), to increase the rotation and increase the moment arm l'> l, Surely take falling off rectifying pressure as price N '<N. But rise friction (pursues 4) , in table tennis ball this is called "to strengthen eager ball " (or the name cutting). Be that eager exceeding infertile (pressure is exactly increasingly minor) , rotates increasingly quickly, but two dangers appears on this meeting: First, the speed of the back ball decrease (center of mass velocity), the ball can not be over the net; Second, it slips， and the ball fell off.

累死了