我觉得几乎所有证据都说明这是一头幼龙，基本能肯定是只小霸王龙。

　　However, there is some evidence in terms of CAT scans on the inside of the skull,然而对其颅内结构的CT扫描发现了一些证据，

　　and some of the hollow chambers in that brain case that are a little peculiar in Nanotyrannus.

　　矮暴龙颅骨里的一些空腔显示它有些不同之处。

　　And that's another key difference between these two predators, the shape of their brains.

　　两种掠食者间另一个主要区别是它们的大脑形状。

　　CAT scans, performed by Dr. Witmer, gave some surprising results.

　　维特莫博士进行的CT扫描带来了意外的结果。

　　So when we did the CAT scan of T-Rex and, and Nano T, it really looked like there was some striking differences.

　　我们对霸王龙和矮暴龙进行CT扫描时看起来真的有些明显的区别。

　　I mean, we can see some of those differences in the brain here.

　　我们能看到脑的这部分有些不同。

　　Here's the Tyrannosaurus Rex, and when we bring up and look at the brain of Nano T, we really see they're quite different.

　　这是雷克斯暴龙的，我们在观察矮暴龙的大脑时的确发现它们相当不同。

　　Of course they're different in size, Nano T was a smaller animal.

　　当然它们的大小不同，矮暴龙个头儿更小。

　　But really some of the differences go beyond size.

　　不过在大小之外也有些区别。

　　The size and shape of the brain was not the only difference.

　　大脑的大小和形状不是唯一的区别。

　　Experts would discover that the brain was actually positioned differently.

　　专家们发现大脑的位置其实也不一样。

　　The brain of Nanotyrannus is shaped in a very different way from Tyrannosaurus Rex.

　　矮暴龙大脑的形状与雷克斯暴龙的大相径庭。

　　T-Rex held its skull kind of like this, pretty straight on, where Nanotyrannus actually looked like this.

　　霸王龙的头颅会是这样基本是直立的，而矮暴龙的其实看起来是这样的。

　　And you cannot change because that is buried deeply in bone.

　　这是无可改变的，因为这深深地埋在骨头里面。

　　You're not going to change the orientation of those semi-circular canals of the inner ear.

　　这些中耳部位的半环管道方向是根本没法被改变的。

　　So clearly this was a different animal.

　　所以很明显这是一种不同动物。

　　This discovery proved that Nanotyrannus held its skull in a lowered position, making it easier to focus and strike at potential enemies.

　　这个发现证明了矮暴龙把头颅放在更低的位置能够更容易注视和攻击潜在敌人。

　　The evidence clearly suggests that Nanotyrannus is its own species,这个证据清楚的表明了矮暴龙自成一家，

　　because there's enough distinctive differences between it and Tyrannosaurus Rex to justify its name Nanotyrannus.

　　因为在它和雷克斯暴龙之间有充分明显的区别能够为矮暴龙正名。

　　Currently, Nanotyrannus is considered its own species: a fast and aggressive predator that could hunt down and kill juvenile T-Rexes.

　　现在矮暴龙已经被认定是独立物种，一种快速凶猛的掠食者，能够捕猎杀死幼年霸王龙。

　　It stood over 2 meters tall, was 5 meters long and weighed about a ton, approximately half the size and up to a sixth the weight of a T-Rex.

　　它站起来有两米多高，五米长，重约一吨，体型尺寸是霸王龙的一半，重量可达到霸王龙的六分之一。

　　But what Nano T lacked in stature, it gained in speed.

　　不过矮暴龙虽然块头不敌，却有更出色的速度。

　　Nanotyrannus has much longer, more slender legs than Tyrannosaurus Rex.

　　矮暴龙与霸王龙相比腿部更加修长，也更加纤细。

　　That means this is an active, running dinosaur.

　　这说明它们是一种活跃擅跑的恐龙。

　　Even though Tyrannosaurus Rex can run, he's not really designed to run all the time.

　　尽管雷克斯暴龙能跑，但它的设计并不适合一直奔跑。