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请输入英文单字，中文词皆可：

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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