名词
中文翻译：顶部紧固件
同义词：
['fastener', 'fastening device', 'fastening mechanism']
例句：
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1.The car's top fastener was loose and causing the engine to overheat.
汽车的顶部紧固件松动，导致发动机过热。
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2.The engineer used a special tool to tighten the top fastener on the machine.
工程师使用特殊工具来紧固机器上的顶部紧固件。
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3. The construction workers had to replace the broken top fastener before they could continue work.
建筑工人不得不更换断裂的顶部紧固件，才能继续工作。