"I am very happy because Sally, now she is free.

VOA: standard.2010.03.27

Women, for example, living in places where they are oppressed are in general less happy than women living in free countries.

以女性为例，生活在压迫制度下的一般,没有生活在自由国家的女性快乐。

哈佛公开课 - 幸福课课程节选

This should make sense, because if an atom has a very high electron affinity, that means it's really happy taking an electron from another atom, or taking a free electron -- that that's very favorable.

这应该是合理的，因为如果一个原子有很高的电子亲和能，这意味着,它非常乐意从另外一个原子那里夺取一个电子，或者得到一个自由电子--这是非常利于发生的。

麻省理工公开课 - 化学原理课程节选

He called the North a, quote, "Happy state of mediocrity, a hardy race of free, independent republicans."

他说北方是,"快乐的平庸之地,这里住着一群自由独立的共和主义者"

耶鲁公开课 - 美国内战与重建课程节选