opt-in

形容词 adj.
中文释义

英文释义

形容词 adj.
  1. The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising. not-comparable
    — They set up an opt-in mailing list, so that those who wanted the notices could subscribe.

词汇关系

反义词
opt-out

词源

From opt + in.
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