center of oscillation meaning in English

摆动中心
摆心
震荡中心
振荡中心
振动中心

The sweet spot is a point , not an area , although some refer to the " sweet spot " on the racquet being " large . " another alias for the center of percussion is " center of oscillation . " the " sweet " area on the string bed is where the racquet ' s bounce is maximized , and this has nothing to do with the center of percussion
下面这段比较费解，甜点是接球时受到多大力的决定因素，甜点（位于球拍）的位置越高，球拍承受来球的力量就越小，手上承受来球的力量就越大，球拍的平衡点离手较近，击球产生的力矩就越小，所以对胳膊的冲击也越小。