optional読み方
発音記号・読み方: [ 'ɔpʃənəl ]
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- optional日本語の意味：optional adj. 随意の.【副詞】Contributions are purely optional. 寄付はまったく任意です.【＋前置詞】It is optional for the writer or speaker either to express the “that" or to leave it out. その that を略すか略さないかは書き手また
