如果你断定飞进来的皮球是一个“外来干扰物”的话，你应该中断比赛，并在中断时皮球所在的位置以“坠球”的方式重新开始比赛。
If you consider the ball to be an 'outside interference', play should be stopped and the game restarted with a drop ball.
一些外来的干扰物，例如你的手机、电视都会影响你的学习，就像一些内在的干扰物，例如忧虑或愤怒也会达到一样的效果。
External distractions like your phone and the TV can ruin your study sessions just as internal distractions like worry and anger can do the same thing.
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