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.
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。