Besides deciding challenges, Hawk-Eye also offers various statistics, like serve direction and placement, shot comparisons and player movement tracking information.
除了确认挑战有效与否，鹰眼还提供各种统计数据，如发球方向和落球点、击球比较和球员移动路径。
Serve mostly to weakness but vary the placement and spin some. A 20% variation is enough to keep opponent guessing.
发球主要发往对手的弱点，但是偶而也要变换落点和旋转，只要有20%的变化就可以让对手难以捉摸。
By concentrating on strong and repeatable mechanics, good placement, and spin, you can develop a second serve that helps you play points on your terms.
依靠有力的和可重复的技巧，良好的落点、旋转，你可以改进你的二发使你发挥应有的水平。
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