手心向下从左向右甩腕,拇指从内侧向外侧翻转 上旋发球时身体的朝向是很重要的,这样能够流畅地进行从左向右的甩腕动作,也就是说只有这样才能充分地使球旋转。为此,抛球后的左手应尽量停留在原处,同时左脚先落地。 Palms down from left to right rejection of wrist, thumb from the inside to the outside of the spin on the spin when the body orientation is very important, so smooth from left to right wrist rejection action, that is the only way to fully Turn the ball. To this end, after throwing the left hand should stay in the same place, while left foot first landing.