他补充说使我们作为一个种群能够生存进化成为可能的大部分原因是我们“控制和使用火，制造使用衣服的能力，新的打猎方式和新的石器工具的制造”。

He added that our success and progression as a species has been made possible, in large part, to our "controlled use of fire, the ability to use clothing, new hunting strategies and new stone tools."

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一个左撇子工具制造者会做出相反的图案。

A left-handed toolmaker would produce the opposite pattern.

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What these people have to work with are the tools that have been passed down to them, The poverty of the people Frost writes about is important.

这些人需要用一代代传下来,的工具或者自己制造的工具，弗罗斯特所写的这些人的贫穷非常重要。

耶鲁公开课 - 现代诗歌课程节选