One bone was a piece of rib from a cow-sized mammal; the other, a leg bone fragment from a mammal the size of a goat.

一根骨头是来自牛一般大小的哺乳动物的肋骨；另一根是来自山羊一般大小的哺乳动物的腿骨碎片。

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the other, a leg bone fragment from a mammal the size of a goat.

另一个来自一种长得像山羊的哺乳动物的腿骨碎片。

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Between this and the lower leg bone is a natural recess known as the sinus tarsi, which allows ankle flexibility.

在这块骨头和小腿骨之间的是一个天然的凹槽，被称为“跗骨窦”，它决定了脚踝的灵活性。

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The evidence comes from DNA extracted from a 40, 000-year-old leg bone found in a cave near Beijing.

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Then a steel or titanium rod is placed inside the hollow leg bone to reconnect it where it broke.

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One danger of the procedure is that the leg bone could break, says Richardson, particularly because it's the bone that just finished healing.

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