They forgot how to make bone tools, catch fish and sew skins into clothes.

忘记了如何用骨头制作工具、抓鱼以及把兽皮缝制成衣服。

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In 1999, the earliest man-made tools so far were found in Fanchang in central China's Anhui Province. More than 170 stone tools were unearthed here with a number of bone tools.

1999年，中国考古学家在安徽繁昌发现了世界上最古老的石器，计170余件，同时出土了少量的骨器。

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They found that these bone tools cut the carcass effectively.

他们发现这些骨质工具切割兽肉是挺好用的。

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If you were searching for unique populations of cells within the bone marrow what tools would you use to look for them?

如果你要在骨髓中,找一组特定的细胞群,你用什么工具来找呢

耶鲁公开课 - 生物医学工程探索课程节选

Living in 14 villages along the Porcupine herd's migration route, some 7, 000 Gwich'in maintain a traditional culture linked to caribou meat, skins and bone tools.

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In the Blombos Cave, over the years he and his team have painstakingly unearthed beads likely used by humans on necklaces 75, 000 years ago, bone tools dating back 80, 000 years and the world's earliest known painting kit.

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The tools also improve the quality of tissue and bone grafts.

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