So that's just a little bit of a check for yourself, and it should make sense because what you're doing is you're calculating the difference between energy levels, so you just need to flip around which you put first to end up with a positive number here, and that's a little bit of a check that you can do what yourself.

所以你们总要确保括号，离得这项是正的，这是你们自己,可以做的检查，这事很有道理的，因为你们做的是计算能量差,所以你需要调整顺序来保证一个正数，这是你们自己可以做的检查。

麻省理工公开课 - 化学原理课程节选

There's a special student membership so I encourage you to check out the international positive psychology association and join to stay abreast of the latest development in the field of positive psychology.

协会设立特别的学生会员,我鼓励你们了解一下,国际积极心理学协会,加入并把握积极心理学领域,最新发展动态。

哈佛公开课 - 幸福课课程节选