名词短语
中文翻译：未打结的球对
同义词：
['unknotted pair of balls', 'untied pair of balls']
例句：
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1. Theteam won the game with an unknotted ball pair.
球队用未打结的球赢得了比赛。
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2. The children played catch with their unknotted ball pairs.
孩子们用他们的未打结的球进行接球游戏。
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3. The coach instructed the players to unknot the ball pairs before the next match.
教练指示球员们在下一局比赛前解开球对。