| 单词 | opt-in |
| 释义 | opt-in ˈopt-in /ˈɒpt.ɪn/ aep /ˈɑːpt-/ noun [C or U] ► F0 the fact of choosing to take part in an activity, arrangement, etc. rather than being forced to take part: » The government operates an opt-in rather than an opt-out system, which means that permission must be sought on a case-by-case basis. |
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