That period was when human ancestors may have first started using stone tools to butcher carcasses and so were less reliant on huge mandibles to process tough shells.

 
  • 可能也是在这段期间,人类始祖首度开始使用石器来切割兽尸,因此较不需要依赖巨大的下颚来咬碎硬壳。
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