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单词	pervalvar axis
释义	pervalvar axis noun per·​valvar axis ¦pər, (ˈ)per+…- : the longitudinal axis of the frustule of a diatom Word History Etymology per- + valvar
随便看	firms up firmware firmwares firn firn line firnification firns firrier firriest firring firrings firry firs first first aid first aid kit first among equals first and foremost first and last first angle first approximation first attack first base first baseman first bases

英语词典包含469781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。