英语词汇expansion bolt怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	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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