"happiness" 是高兴的名词形式，来源于中世纪拉丁语 "fepcitas"，意思是幸福、快乐。
英文例句：
She felt a sense of happiness wash over her as she watched the sunset.
（当她看着日落时，她感到一种幸福感涌上心头。）
He's always been a very happy person and it's contagious.
（他一直是个非常快乐的人，而且这种快乐很容易传染。）
Happiness is not something ready made. It comes from your own actions.
（幸福不是一种现成的东西。它来自你自己的行动。）