名词
中文翻译：球指数
同义词：
['ball correlation', 'ball indexing']
例句：
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1.The team's performance has a significant impact on the ball index.
球队的表现对球指数有显著影响。
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2. The ball index is used to measure the efficiency of the game.
球指数用于衡量比赛的效率。
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3.The ball index is closely related to the player's performance and skill level.
球指数与球员的表现和技能水平密切相关。