我们正在解决的可能是我们所知的人类进化过程中缺失最大的一环。
We're dealing with probably the biggest missing link in what we know about human evolution.
一旦人类被看作是在进化过程中发展起来的，那么“人类是包含在他的本质中的一种物质”的观点似乎就站不住脚了。
Once man came to be seen as developing in the process of evolution, the idea of a substance which is contained in his essence seemed untenable.
其实，正是肩部改变了人类的进化过程，如果没有它，我们可能无法想象出，我们能有现在这样的生存技能。
It turns out that the shoulder altered the course of human evolution by giving us survival skills we never could have imagined without it.
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