名词
中文翻译：倒扣的螺母
同义词：
['countersunk bolt', 'countersunk screw', 'countersunk nut']
例句：
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1. The engineer useda countersunk nut to secure the bolt in place.
工程师使用一个倒扣的螺母来固定螺栓。
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2.The carpenter carefully removed the countersunk nut to replace the worn-out one.
木匠小心翼翼地移除了倒扣的螺母以更换磨损的螺母。
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3.The technician had to remove the countersunk nut before he could start working on the machine.
技术人员必须先移除倒扣的螺母才能开始修理机器。