乒乓球本身是一个无固定轴的物体,但它一旋转起来,就会自然而然地产生出一个轴来。乒乓球旋转的基本轴有三条:左右轴(与球台端线平行)、上下轴(与台面垂直)和前后轴(与球台边线平行)。乒乓球绕左右轴转可产生上旋或下旋;绕上下轴转可产生左、右侧旋;绕前后轴转可产生顺旋或逆旋。须说明的是, Table tennis itself is a fixed axis of the object, but when it is rotated, it will naturally produce a shaft to. There are three basic axes for table tennis rotation: left and right axes (parallel to the table end), upper and lower axes (perpendicular to the table), and front and rear axles (parallel to the table edge). Table tennis around the axis turn can produce spin or spin down; turn around the shaft can produce left and right side spin; around the front and rear axle can produce cis or anti-spin. It should be noted that,