英语词汇“optional”的读音、翻译、释义、用法及例句-金世纪网

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	routine routine routined routinely routineness routinenesses routiner routines routine² routine¹ routing routing routining routinish routs roving rovingly rovingness rovingnesses rovings row row row rowable rowage

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