这项“地球人的首个代表性样本”，作者写道，“被用于探寻为什么‘幸福’与高收入相关的原因。”
This "first representative sample of planet earth," the authors wrote, "was used to explore the reasons why 'happiness' is associated with higher income."
故事似乎在作者的头脑中是真实发生过的，似乎作者们要做的就是在头脑中探寻而非创造它们。
The thing seems to have some kind of reality in one's head... it seems to be something that one is discovering rather than inventing.
本文作者深入非洲心脏地带，以探寻答案。
The author travels deep into the heart of Africa, searching for answers.
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