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单词 optional
释义 optional /ˈɒpʃənl; NAmE ˈɑːp-/

adjective

that you can choose to do or have if you want to可选择的;选修的You must wear a shirt and tie, but jackets are optional.你们必须穿衬衫、系领带,但是否穿夹克衫则自便。This model comes with a number of optional extras (= things you can choose to have but which you will have to pay extra for).这种型号有多种配件可供选购。
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