any of various extinct flying reptiles of the order Pterosauria,including the pterodactyls,of the Jurassic and Cretaceous periods,characterized by wings consisting of a flap of skin supported by the very long fourth digit on each forelimb是什么意思_any of various extinct flying reptiles of the order Pterosauria,including the pterodactyls,of the Jurassic and Cretaceous periods,characterized by wings consisting of a flap of skin supported by the very long fourth digit on each forelimb在线翻译_英语_读音_用法_例句