non-optional

形容词 adj.
中文释义

英文释义

形容词 adj.
  1. Alternative form of nonoptional. alt-of,alternative,not-comparable
    — BR offered discounts on round trips to encourage optional days out and weekends away, but it did not want to discount one-way tickets which were typically used for non-optional journeys.

词源

From non- + optional.
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