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释义
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
compulsory
或
obligatory
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更新时间:2025/3/10 11:01:57