Using tools like this one to obtain bone marrow, the most nutritious part of a carcass, they set in train an ancient virtuous circle.

通过使用类似这工具来获取骨髓这种动物躯体中最有营养的部分，他们开始培养起一个古老的良性循环。

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He broke a bone in his leg and the doctor set it.

他腿部骨折，医生把它接好了。

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With defenseman Tyler Myers set to miss the rest of the season with a broken bone in his leg, Chad Ruhwedel made his NHL debut shortly after signing a two-year contract with Buffalo.

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But as my companions and I clambered up and down summits, the brooks we came across were bone dry, and a bit of anxiety began to set in.

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