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。

youdao

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。

youdao

Third, scientists performed a test on the dinosaur leg bone that showed that it contained collagen.

第三，科学家的测试发现这个恐龙腿骨化石中还有胶原蛋白。

youdao

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