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TOEFL IELTS BNC: 5815 COCA: 5692
optional
/ˈɒpʃənl ||; ˈɑpʃənḷ/adj that you can choose or not choose 可选择的;非强制性的: an optional subject at school 学校里的选修科目 [OPP] compulsory or obligatory 反义词为compulsoryobligatory
TOEFL IELTS BNC: 5815 COCA: 5692
optional/ˋɑpʃənḷ; ˈɒpʃ$nəl/ adj if something is optional, it is available but you do not have to choose it [ compulsory ] 可选择的﹐非强制的: The sunroof is optional. 车顶天窗是可选配置。
TOEFL IELTS BNC: 5815 COCA: 5692
optional adjectiveIf something is optional, you can choose it or not choose it: All students must learn English, but German is optional. opposite compulsory

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