The use of simple stone tools to remove meat and marrow marks a crucial moment in the human story.
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 marks show where stone tools were used to slice and scrape meat from the carcasses and where the bones were crushed to expose the nutritious marrow inside.
这一痕迹显示了人类祖先使用石器工具从动物身体的哪个部位将肉切割下来，同时也显示了动物骨头是在哪里被切碎，骨头被切碎后骨头内部有营养的骨髓就显现出来了。
Archaeologists revised the date after spotting distinctive cut and crush marks made by stone tools on animal bones dating to 3.4m years ago.
考古学家在辨认出340万年前的动物骨头上，存在石器工具造成的明显变形的切割痕迹后，修改了人类最早使用工具的时间。
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