乔治华盛顿大学的人类学家艾琳·玛丽·威廉姆斯，试图找出进化是如何发生的，制造工具是怎么帮助塑造我们的手和手腕的。

At George Washington University, anthropologist Erin Marie Williams is trying to find out how that evolution took place. How did tool-making help shape our hands and wrists?

youdao

乔治华盛顿大学的人类学家艾琳·玛丽·威廉姆斯，试图找出进化是如何发生的，制造工具是怎么帮助塑造我们的手和手腕的。

At George Washington University, anthropologist Erin Marie Williams is trying to find out how that evolution took place. How did tool-making help shape our hands and wrists?

youdao