translation.en: Now if we make some guesses about how long Homo erectus lived, what their generation time was, that's about 40,000 generations of parents to offspring, and other individuals watching, in which that hand axe didn't change.
translation.zh: 现在我们可以做几个关于猿人生存时间 和他们的世代的猜想 在约四万代的时间里 从父辈到子辈，以及周围人的观察中 手斧没有任何改进