And there have been all kinds of sabertoothed critters over the past quarter-billion years.

在过去的 25 亿年里，出现了各种各样的剑齿动物。

Ridiculously long canines had already been a trend for millions of years by the time Smilodon was prowling around, and scientists have only just begun to understand how sabertoothed carnivores used their dental weapons.

当剑齿虎四处游荡时， 长得离谱的犬齿已经成为数百万年的趋势，而科学家们才刚刚开始了解剑齿食肉动物如何使用它们的牙齿武器。

The fact remains, by the time the last of the sabercats disappeared -- only about 8,000 years ago -- there had been some kind of sabertoothed predator on the planet somewhere for 40 million years!

事实是，当最后一只剑齿虎消失时——仅在大约 8000 年前——地球上的某个地方已经存在某种剑齿虎食肉动物 4000 万年了！