Mishaps are like knives that either serve us or cut us as we grasp them by the handle or blade.---Lowell

　　灾难就像刀子，握住刀柄就可以为我们服务，拿住刀刃会割破手。---洛威尔

　　【世博精解】

　　我们来看一下刀的表达方法。

　　blade means the flat-edged cutting part of a sharpened weapon or tool.是指刀刃削磨用的武器或工具的刀口处用来切割的部分。

　　Knife means a cutting instrument consisting of a sharp blade attached to a handle.是指有柄的小刀由一个附在柄上的锋利刀片构成的切割工具。

　　Sword means a weapon consisting typically of a long, straight or slightly curved, pointed blade having one or two cutting edges and set into a hilt.是指剑，刀一种武器，通常由长而直或微微弯曲的、尖刃，有一面或两面锋利切边的刀锋组成，刀锋嵌入刀柄之中。