英语词汇“expansion bolt”是什么意思，“expansion bolt”的读音、用法及例句翻译-乐坝网

词汇	expansion bolt
释义	expansion boltn.（名词） A bolt having an attachment that expands as the bolt is driven into a surface.扩开螺栓：带有扩开附件的螺栓，当螺栓进入物体表面时附件可以扩开
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