The American lion is arguably the largest and most powerful feline that ever lived.

美洲拟狮有可能是有史以来最大最有力的猫科动物。

And amongst the bones, we've gotten complete skeletons of the American lion and the short-faced bear.

在这些骨头里面，我们有美洲拟狮和短面熊完整的骨架。

Thinking it might be a huge unknown species of North American lion, Jefferson warned explorers Lewis and Clark to keep an eye out for this mysterious predator.

想着它可能是某种未知的大型北美狮，杰斐逊提醒探险者刘易斯和克拉克要注意这种神秘的猛兽。