劳动的自然价格是使劳动者能够生存并延续其后代所必需的价格，既不增加也不减少。
Mathematics advances not by the efforts of individuals alone but through the collective work of generations.
We are the product of our evolutionary past.
情绪可以自动捕获注意力，展示了情感系统和认知系统之间的密切联系。