这类岩石同动物骨头一起被发现，而且很明显地可以看出这些石头被加工成为可以各种屠宰工具，可以用于在大草原上被猎杀的动物躯体上剥肉、削骨。
They were found next to bones, and it was clear that these stones had been shaped into butchering tools to strip meat and break into the bones of animals killed on the savannah.
使用简单的石器工具去切肉与骨头，在人类历史中标志着一个至关重要的时刻。
The use of simple stone tools to remove meat and marrow marks a crucial moment in the human story.
忘记了如何用骨头制作工具、抓鱼以及把兽皮缝制成衣服。
They forgot how to make bone tools, catch fish and sew skins into clothes.
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