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俗称钩子,泛指任何有突出弯部分的工具或结构,通常为硬度强、刚度高的材料(比如金属)所制,主要功能是挂住其它物体并传递平行拉力。钩可能有带有尖锐的末端,可以用来刺穿其它物体表面达到钩挂的目的。有一些钩子还可能在末端还额外带有钩状的倒刺,以防止脱落。

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