推荐回答（4个）
下旋发球
乒乓球运动发球的一种。分加转与不加转。正、反手均可运用。正手发球时，左脚在前，身体略向左偏斜站立，左手向上抛球，右上臂稍外展，前臂内旋井向身体后上方引拍。以前臂和手腕的发力为主。发加转球时，执拍手的上臂带动前臂加速向前下方挥拍，前臂迅速旋内。拍面后仰较大，击球的中下部后向底部摩擦。发不加转球与发加转球的动作基本相同。主要区别是前臂旋内稍慢，拍面后仰角度较小，球拍触球的中下部或中部后有一个向前推送的动作，使挥拍的作用力线接近球心，以减小旋转。
急下旋发球
又称“奔球”。乒乓球运动发球的一种。正手和反手均可使用。正手的动作要点是：（1）左脚稍前站立。在将球向上抛起的同时右臂内旋，使拍面稍前倾。手腕放松，向身体右后方引拍；（2）迎球时，上臂带动前臂向左前方挥拍。触球瞬间前臂迅速旋内，手腕做抖动的鞭打动作。拇指压拍，使拍面稍前倾，触球的右侧部后向右上方摩擦；（3）触球点离台面较近，第一落点在端线附近。特点是球速快，落点长，带有一定的右侧上旋力，飞行弧线低并向对方的右侧偏离，常用于偷袭或调动对方。
反手右侧旋发球
乒乓球运动发球的一种。动作要点是：（1）两脚平行站立或右脚稍前，身体略向左偏斜，站位左半台；（2）左手向上抛球的同时，腰部略向左转，右上臂内旋并向身体腹部的左侧方引拍；（3）发右侧上旋球时，执拍手臂向右上方挥动，击球的中下部后再向右侧上方摩擦；（4）以前臂和手腕发力为主，辅以腰部的转动，同时将身体重心从左脚移向右脚。特点是旋转变化多，动作相似不易分辨，球的飞行弧线向左（右）偏拐，能加大对手的接球难度，使回球向左（右）上（下）方反弹。
高抛发球
乒乓球运动发球的一种。发球者先将球抛至高度为2—3米空中，待下落到一定程度时击球。挥拍时上臂外展的幅度较大，要借助转腰和蹬地的力量。由于抛球高度大幅度提高，使球体下落时的重力加速度骤增，具有球速快、旋转强、时间差明显等特点。有侧身正手左侧上（下）旋球、侧身正手上旋长球、反手右侧上（下）旋球等之分。 由中国运动员发明。
下蹲式发球
乒乓球运动发球的一种。指发球者采用下蹲姿势进行发球。多用于横拍运动员。分为正手右侧上（下）旋球和利用球拍反面发球的正手左侧上（下）旋球两大类。正手右侧上（下）旋发球的动作要点是：（1）左脚在前，身体向右偏斜站立。在向上抛球的同时两膝弯曲，呈半蹲姿势，身体重心在两脚之间。引拍时上臂外展，前臂屈，将球拍举至右肩上方；（2）击球时，前臂加速伸开，手腕内收。当球下降至与网同高或稍高于同时，球拍触球的中部并向右侧上方摩擦。如发右侧下旋球则需改变挥拍的方向，使球拍触球中部后向右侧下方摩擦。发球后应迅速站起。这种发球旋转较强，变化多，飞行弧线和反弹方向与下手类发球不同，对方往往难以适应甚至直接失误。
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用手腕的抖动是发下旋球最好的·最隐秘的方法·你可以试试·只用手腕向下摩擦·约10公分左右·但是如果你真的想学的话·你可以也这样发出来上旋球·而且只要不是专业的·根本看不出你发的是什么球·关键问题是·手腕抖动要灵活·要有力·发下旋球时候·向下摩擦完后·要立即把抓球拍手往上提一下·如果没有这个动作的话·你发出来的什么球·只要是一个懂的人就能看出来·
如果你是个女孩子·我建议你用反手发球·对你自身也有很大的帮助·因为女孩子侧身慢·而用反手发球则弥补了这个缺点·
尽量将球拍与球台之间的角度控制在较小的范围内,发球时球拍由外往内来一个
乒乓球教学：如何发加转下旋球？“四要素”一定要掌握！
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