李宁击球手击出平直球区别王牌记分和一般墩牌记分的横线对阵开球线对阵开球队员球场等的场线场界 常用于组合 side line 边线
The horizontal line used by Li-Ning batsmen to hit straight balls, which distinguishes ace runs from regular backhand runs, against the tee line, against the tee player, and on the court, is often used as a combination side line
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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