英语词汇“optional”的读音、翻译、释义、用法及例句-留学网

词汇	optional
释义	op·tion·al /`ɑpʃənḷ; ˈɒpʃənəl/ adj if something is optional, you can choose to have it or do it, but do not have to 可选择的，非强制的: The sunroof is optional. 车顶天窗是可供选择的额外配置。
随便看	boundary boundaryless boundarylessness boundarylessnesses bounded bound-in bounding boundingly boundless boundlessly boundlessness boundlessnesses boundness boundness' boundnesses boundnesses' boundness's bound-off bounds bound's bound-up-in bound-with *bound² bound³ bound¹

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