The steel used to make bombs is of extremely high quality, so that the knives made from it are especially sharp and durable. And because they are uniquely hard yet resilient, they do not easily change shape, even if they are used to cut through very hard objects.
製造砲彈的鋼鐵品質極佳，以之打製出來的菜刀也特別鋒利、耐用，剛中帶韌的特性，即使切割硬物也不易變形。