印第安人凿制燧石箭头。
这些就是我们所谓的旧石器时代最晚的人类，因为他们只有凿制而成的器具。
These are the latest of the men that we call Palaeolithic(Old Stone Age) because they had only chipped implements.
除了他们那些以狩猎为生的祖先所用过的凿制器具外，他们还慢慢开始制作光滑的石器。
They were also beginning to make in addition to the chipped implements of their hunter forbears implements of polished stone.
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