translation.en: We calculated on the one hand how much energy a primate gets per day from eating raw foods, and on the other hand, how much energy a body of a certain size costs and how much energy a brain of a certain number of neurons costs, and we looked for the combinations of body size and number of brain neurons that a primate could afford if it ate a certain number of hours per day.
translation.zh: 一方面，我们计算着 一个灵长类动物每一天获取多少能量 借由吃生的食物， 另一方面，有多少能量 在一个特定大小的身体中消耗 和有多少能量在含有特定数量神经元的大脑中消耗 然后我们找到一个结合 身体尺寸和大脑神经元数目 灵长类动物能夠负担得起 如果它每天花一定数量的时间在吃上面。