领取体验课400-820-9228

optional

/ˈɒpʃənl/
/ˈɑːpʃənl/

释义

  • adjective可选择的

英英释义

  • adjectiveIf something is optional, you can choose it or not choose it.

场景例句

  • All students must learn English, but German is optional.

词态变化

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