我们做了一个特殊的足球，里面带一个铃铛。这样通过铃铛声音，孩子们可以跟着球跑并能判断出赛场情况。
We made a special ball, with a bell in it, so the kids can keep track of where the ball is and what it's doing by listening for it.
球内铃铛的声音会告诉运动员球的位置，因此场下观众在观看比赛时必须保持绝对的安静。
Bells inside the ball tell the players where the ball is, and because of this, spectators must be completely quiet when watching a game.
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