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V to choose to be involved in or part of a scheme, etc 决定参加(计划等)
There are two types of routine testing: opt-out and opt-in.
常规检测有两种：选择退出或选择参加。
youdao
You can also look for them on the opt-in statistics dashboard.
你也可以看看可选的统计面板。
Communities are forming (all opt-in) and are segmenting by interest.
依照兴趣，社区得以组建（全参与），同时被分割为小块。
Hopefully, if you opt-in for this tablet, you can live with that permanent application load.
ENGADGET: Samsung Galaxy Tab 2 7.0 review
"Opt-in is really the most burdensome privacy restriction that we implement in the U.S., " Zanneis says.
FORBES
After a few weeks, YesMail agreed to the stricter double opt-in rule and dropped its suit.
FORBES: Spam Warfare
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