这硬骨头把刀刃弄钝了。
在墙上钉几个磁性支架来存放刀具是个不错的方法，既方便取用，又能把刀具跟其他物品分开，免得磕磕碰碰地弄钝弄花了刀刃。
A magnetic holder screwed to the wall is a practical way of keeping knives always within reach and isolated from other objects that could dull and dent the blades by knocking against them.
用剪刀剪硬纸板，你会把剪刀弄钝的。
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