translation.en: So, what we did for the first two and a half years was four things: We did an extensive review of the literature in related fields, like cognitive psychology, spatial cognition, gender studies, play theory, sociology, primatology.
translation.zh: 我们在刚开始的两年半内 做了四件事情： 我们在和文学相关的领域进行了广泛的分析评论， 其中包括认知心理学， 空间认知，性別研究， 游戏理论，社会学，动物学——