opt in

• v. 决定参加

opt in的用法和样例：

例句

用作动词 (v.)

1. She had known about the scheme for some time, but only opted in at the last minute.
   她知道这个计划已有一些时候，但直到最后一分钟才决定参加进去。

词汇搭配

• opt in favour of 选择