translation.en: So, what technology brought, through the very simple tools like these stone tools here -- even something as small as this -- the early bands of humans were actually able to eliminate to extinction about 250 megafauna animals in North America when they first arrived 10,000 years ago.
translation.zh: 因此技术都带来什么， 通过这样很简单的工具，像这里的石器， 甚至一些小到这样的工具， 伴随人类的早期动物， 当它们1万年前第一次出现在北美洲， 大约250种巨型动物群 事实上它们都被淘汰和灭绝了。