elective

/ɪˈlɛktɪv/ 形容词 B2

中文：选修的、可选择的、选举的

Of, or pertaining to voting or elections; involving a choice between options.
Open to choice; freely chosen; (also, usually) unnecessary; minor. · After accounting for all of my required courses, there is hardly any room in my schedule for any elective ones.
Scheduled and nonemergent (regardless of whether necessary or unnecessary and whether minor or serious). · It was very confusing hearing my cancer surgery being classified as "elective surgery". Am I "electing" to live rather than die?

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