Yahoo香港字典 搜尋

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1. Oxford Dictionary

   optional

   • IPA[ˈɒpʃən(ə)l]

   英式

   • adj.
     available to be chosen but not obligatory
2. • 釋義

   adj.

   形容詞

   • 1. available to be chosen but not obligatory a wide range of optional excursions is offered