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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Yes, this is a human leg bone.

是的，这是人类的腿骨。

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Objective: To explore a method for repairing leg bone exposure.

目的：探讨修复小腿骨外露的方法。

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

BBC: Fossil human traces line to modern Asians

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

CNN: Kevin Ware could be playing again in less than a year

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

NPR: Ailing Barbaro Recovering from New Operation