我不知道這個有沒有一個專業的詞彙,總之,國外一般把金屬的軟硬度分為以下幾類:軟(soft)1/4硬度(1/4 hard)1/2硬度(1/2 hard)3/4硬度(3/4 hard)硬(hard)也就是說hard temper的程度決定了需要
His father gave him a bag of nails and told him that every time he lost his temper, he must hammer a nail into the fence