这处理情感的大脑部分被发现在史前哺乳动物的大脑。（而不是爬行动物的大脑！）
This part of the brain, which processes emotion, is found in the paleomammalian brain. (Not the reptilian brain!
剑齿虎，是已经灭绝的剑形齿类动物的一种，这也许是史前哺乳动物中最出名的一种了，也是最有名的剑齿类猫科动物。
Smilodon, is an extinct genus of machairodont felid. It is perhaps one of the most famous prehistoric mammals, and the best known saber-toothed cat.
早期人类更多的是作为一个猎物，而不是猎人。新发现的史前灵长类祖先化石验证了这一点，他们经常被饥饿的鸟类和肉食哺乳动物吞食。
Early humans may have evolved as prey animals rather than as predators, suggest the remains of our prehistoric primate ancestors that were devoured by hungry birds and carnivorous mammals.
早期人类更多的是作为一个猎物，而不是猎人。新发现的史前灵长类祖先化石验证了这一点，他们经常被饥饿的鸟类和肉食哺乳动物吞食。
Early humans may have evolved as prey animals rather than as predators, suggest the remains of our prehistoric primate ancestors that were devoured by hungry birds and carnivorous mammals.
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