This girl deserves to gain happiness.

这个女孩应该得到幸福。

youdao

Please forget the bad, you will gain happiness!

请忘记那些不好的，你们会收获快乐！

youdao

We can gain happiness from labor, to experience life from the labor.

我们可以从劳动中获得快乐，从劳动中体验生活。——蒋慧。

youdao

How to gain, how to keep, how to recover happiness, is in fact for most men at all times the secret motive of all they do, and all they are willing to endure."

如何获得，如何保持，如何重获快乐，是多数人时刻怀有的秘密动机，是他们愿意忍受一切的目的“

哈佛公开课 - 幸福课课程节选

The economists reckon that people gain happiness - though you could call it feelgood or wellbeing factor if you prefer - from attending events both sporting and cultural.

BBC: Going for the happiness gold

If players survive the early game, there are a number of objectives to pursue, including digging deep into the earth for valuable resources that allow additional advancement, increasing village happiness to attract immigrants, outfitting citizens and soldiers, and even procuring heroes that can gain experience and level up as they hunt down the dangers in the depths.

FORBES: Towns: A Brilliant But Messy Menagerie