(also Cycadophytina), a subphylum of gymno-spermous plants that includes three classes: Lyginopteridopsida, Cycadopsida, and Bennettitales.
英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。