- a level playing field公平竞争的机会;人人机会均等;
- ball valve球阀，弹子阀;
- ball test球试验;
- ball room舞;
- ball picker[体]捡球人;
- ball not in play球不在比赛中
- ball mill球磨机;
- ball lock球形闸门;
- ball joint球窝接合，球窝接头;球结;球节;
- ball in play赛中球;局中球;
- ball grinder球磨床;
- ball gamen.球类运动;棒球;情况;局面;
- ball cockn.浮球阀;球旋塞;
- ball boyn.（给打网球的人捡球的）球童;
- ball bearingn.滚珠，球轴承，滚球轴承;
- ball bearingsn.滚珠，球轴承，滚球轴承( ball bearing的名词复数 );
- ball boysn.（给打网球的人捡球的）球童( ball boy的名词复数 );
- compete on a level playing field在公平的竞争环境中竞争
- get the ball rolling开始;
- level playing field[财]公平竞争环境;
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