translation.en: It certainly seems that we're going about our lives, that what we're doing, who we're with, what we're thinking about, have a big influence on our happiness, and yet these are the very factors that have been very difficult, in fact almost impossible, for scientists to study.
translation.zh: 这就好像我们正面对的日常生活中， 我们正在做的事情，我们和谁在一起，我们正在考虑什么， 对我们的幸福指数有很大的影响，不仅如此 还有很多因素他们很难， 事实上几乎是不可能，作为研究的素材。