"旋转球"是个多义词，它可以指旋转球（简介）,旋转球（同名游戏）。
空气中运行的旋转球的受力通常分为两种：升力和阻力。
The forces on a spinning ball that is flying through the air are generally divided into two types: a lift force and a drag force.
曲线球：投出旋转球，使球的飞行线路呈曲线。
Curve ball: a pitch thrown with a rotation that makes the ball curve.
上手发球有不同的方法，例如上手飘球、上手旋转球和大力发球等。
Overhand serves may be played in differents ways, such as the overhand floater serve, the overhand spin serve and the power serve.
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