And scientists believe that making stone tools helped propel that evolution.
而科学家认为，制造石器帮助推进这种进化。
She studies flint-knapping — the art of making stone tools the way our ancestors did.
她研究燧石敲击术，一门我们的祖先制造石器的手艺。
She studies flint-knapping — the art of making stone tools the way our ancestors did.
她研究燧石敲击术，一门我们的祖先制造石器的手艺。
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