The name Deinonychus means "terrible claw."
"恐爪龙"意为"恐怖的利爪。"
It's a reference to the hinged bone on its foot.
指的就是它脚爪上的铰接骨。
The cutting edge is sheathed in keratin, the same substance that forms a cat's claw.
锋利端表面覆盖角质层，猫科动物的爪子也是由同种物质构成。
But on a Deinonychus, this claw is 10 centimeters long.
只不过恐爪龙的爪子有10厘米长。
This lethal weapon is sharpened to a point and can flex almost 180 degrees.
这一致命武器极其锋利，且几乎可以一百八十度弯曲。
To keep the knife razor-sharp, Deinonychus holds it up off the ground until the moment it's needed.
为了保持刀刃锋利，不到必要时恐爪龙甚至不会让它着地。
Then, in one lightning-fast swipe, this sickle can rip deep into flesh
然后闪电般地一划，这柄镰刀便深深撕破血肉，
delivering a kicking blow with 200 kilos of cutting force.
其切割力可达200公斤。

The key to the Deinonychus' killing blow is the hind leg.
恐爪龙的致命一击，关键在于后腿。
The hind leg is the strongest organ in the body by far and ends in a huge claw like a box-cutting knife.
它的后腿是身体最强壮的器官，其末端的巨爪如切割机一般。
So that cutting, curved knife into your belly,
所以那把锋利弯曲的利刃刺入目标腹部
into the target would cause a fatal wound with one...one flection.
随着一次弯曲，带来了一记致命的伤害。
Deinonychus instinctively knows to go for this giant's weakest point...its neck.
恐爪龙本能地意识到要对准这只庞然大物的弱点，它的脖颈。
You've got the windpipe there.
那里面有气管。
You've got the jugular vein, which if opened up will mean that that Sauroposeidon is dead meat.
有颈静脉，如果它们破裂开就意味着那只波塞东龙必死无疑。
But death does not come quickly or pleasantly.
但死亡的到来既不迅速也不愉快。
For a pack of Deinonychus, a kill this big means a feast.
对一群恐爪龙来说这么大的一次杀戮意味着一顿饱餐。
And their skulls are specially designed for competitive eating.
而它们头骨的结构天生就是用来争抢食物的。
Its jaws are narrow and lightly built.
它的双颚又窄又轻。
And its gums are equipped with 70 sharp, serrated teeth.
牙龈装备了七十颗锋利的锯齿状牙齿。
They're like walking piranhas, perfect at eviscerating a victim.
它们如同行走着的食人鱼，擅长为受害者开膛破肚。
If you look at the teeth carefully, they're ridiculously small.
如果仔细观察它的牙齿，你会发现它们特别小。
They are very, very delicate. They're not killing weapons.
且非常，非常精细。算不上杀人武器。
A single adolescent Sauroposeidon, an animal more than 10 times the size of its killer,
一只少年波塞东龙体型比恐爪龙大十倍，
can feed a pack of hungry Deinonychus for weeks.
可供这只饥肠辘辘的凶手食用数周。
Making the kill worth the effort...and the risk.
因而值得恐爪龙为此拼斗为此冒险。