哈斯拉姆表示，关于这个尚未最终确定的外包计划，各大学可以自由选择参加或不参加。

Haslam has said colleges would be free to opt in or out of the out souring plan, which has not been finalized.

youdao

常规检测有两种：选择退出或选择参加。

There are two types of routine testing: opt-out and opt-in.

youdao

而最重要的是，各州可自行选择参加与否。

Most important, though, is that individual states would be allowed to opt out.

youdao

These are completely optional, not required for the course, so there's no obligation for you guys to get involved in these things, but I'll mention these things as we go along in case anybody would like to get involved in working with professors or graduate students.

这些都是自愿选择的,而不是课程要求,所以并不强制你们都参加,但随着课程的进行,我还会不断提及,便于任何感兴趣的同学,能够与教授或研究生一同参与研究

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

where I can choose the hours I work and be able to attend my daughter's dance recitals

因为当上教授后，我可以选择工作的时间，这样就能参加女儿的独舞表演会了

为什么是会计学呢？ - SpeakingMax英语口语达人

And then the girls going through recruitment get to choose which sorority they want to be in.

然后参加招新的女生选择她们想去的联谊会。

加入女生社团 - SpeakingMax英语口语达人