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optional 音标拼音: ['ɑpʃənəl] ['ɔpʃənəl] a. 可选择的,随意的 可选择的,随意的 optional可选择的 optional任选 选项 optional adj 1: possible but not necessary; left to personal choice [ ant: { obligatory}] Optional \ Op" tion* al\, a. Involving an option; depending on the exercise of an option; left to one' s discretion or choice; allowed but not compulsory; as, optional studies; it is optional with you to go or stay. -- n. See { Elective}, n. [ 1913 Webster] If to the former the movement was not optional, it was the same that the latter chose when it was optional. -- Palfrey. [ 1913 Webster] Original writs are either optional or peremptory. -- Blackstone. [ 1913 Webster] 38 Moby Thesaurus words for " optional": alternative, arbitrary, autonomous, discretional, discretionary, disjunctive, elective, free, free will, gratuitous, independent, nonmandatory, offered, proffered, self- acting, self- active, self- determined, self- determining, spontaneous, unasked, unbesought, unbidden, uncalled- for, uncoerced, uncompelled, unforced, uninfluenced, uninvited, unpressured, unprompted, unrequested, unrequired, unsolicited, unsought, volitional, voluntary, volunteer, willful
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