It takes a long time to learn how to do that, and they excavated the area and they found that this material culture, this way of doing it, these rocks, had passed down for at least 4,300 years through 225 chimpanzee generations.
它们用很长的时间学会这项技能 科学家挖掘这片区域时发现 这种物质文明，这种做事情的方式， 这些石块，已经传承了至少4300年 通过225代的黑猩猩