单词	expansion fastener
释义	DictionarySeeexpansion bolt expansion fastener expansion bolt expansion bolts An anchoring device having an expandable socket that swells as a bolt is tightened into it; used in masonry walls for attaching timber, etc.
随便看	csy csya csyaba csyb csyc csyfa csym c-symmetry csync c-syn protooncogene csyo csyp csys csysa csyt csyv csz cszb cszc cszm cszp csárdás c&t c(t) c-t

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