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	thought thoughtful thoughtless thousand thrall thrash thrasher thrawn thread threadbare threadfin threadworm thready threat threaten three threefold threepence threepenny threescore threesome thremmatology threnody threonine thresh

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。