translation.en: And the other thing there's no evidence for is exchange between groups, because the objects that you find in Neanderthal remains, the tools they made, are always made from local materials.
translation.zh: 另一件事是没有证据显示 在不同族群之间的交换。 因为你在尼安德特人遗址发现的那些物件， 他们制造的工具， 多数是当地材料制成的。