单词	book gill
释义	book gill noun : a gill found in the horseshoe crabs that consists of membranous folds arranged like the leaves of a book Word History First Known Use 1897, in the meaning defined above
随便看	trisomy trisomy 21 trisplanchnic tristachyous Tristan Tristan da Cunha tristania tristans tristate triste tristearate tristearin tristearins tristesse tristetrahedron tristeza tristezas tristful tristfully tristfulness tristfulnesses tristich tristichic tristichous tristichs

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