英语词汇“optional”的读音、翻译、释义、用法及例句-范文大全网

词汇	optional
释义	optionalop·tion·al AW /ˈɑpʃənl / adjective that you can choose or not choose可选择的◆an optional subject at school学校的选修科目◆an optional extra (= something that you can have as an extra thing but must pay for) 收费的可选件 OPP mandatory
随便看	working-class workings workings workload workloads workman workmanship workmen work on sth workout work out workouts work out (to sth) work permit workplace workplaces works works works work sb / yourself up (into sth) worksheet worksheets workshop workshops workstation

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