英语词汇“optional”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	optional
释义	optional adj. being an option only; not obligatory. Derivatives optionality n. optionally adv.
随便看	portamento portative portcullis Porte portend portent portentous porter porterhouse portfire portfolio porthole portico portion Portland cement Portland stone portly portmanteau portolan portrait portraitist portraiture portray Port Salut Portuguese

英语词典包含43808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。