a short, thin piece of wire used to fasten sheets of paper together. It has sharp ends that are pushed through the paper and then bent flat by a special device.订书钉
a U-shaped piece of metal with sharp ends that is fixed into a surface to hold something, such as a wire fence, in a particular positionU 形钉(如 U 形电线卡)
a main product or part of something主要产品;某物的主要部分
basic or main; standard or regular基本的,主要的;标准的,常规的
to fasten something using staples用钉书钉钉住
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