名词
中文翻译：反扣式螺母
同义词：
['countersunk nut', 'counter-sunk bolt']
例句：
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1.The screwdriver was designed to fit the counter-sunk nut on the door hinge.
螺丝刀被设计来适配门铰链上的反扣式螺母。
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2.The engineer used a special tool to loosen the counter-sunk nut on the gearbox.
工程师使用特殊的工具来松开齿轮箱上反扣式螺母。
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3.The carpenter had to remove the counter-sunk nut from the bolt before he could replace it.
木匠在更换螺栓之前，必须先从螺栓中取出反扣式螺母。