一天，他的的父亲给了他一袋钉子，并且告诉他，每当他发一次脾气，就钉一根钉子在后院的围篱上。
His father gave him a bag of nails and told him that every time he lost his temper, to hammer a nail in the back fence.
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第一天，这个男孩在围篱上钉下了37根钉子。
The first day the boy had driven 37 nails into the fence.
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