最先会注意到的是在它鼻子末端巨大的肿块状物，我们称之为圆凸。

　　Well, some paleontologists believe that it housed a gigantic horn like the horn of a rhinoceros.

　　有些古生物学家相信它有巨大的角，就像犀牛角那样。

　　With almost every known dinosaur, their horns are made of bone, but in the case of pachyrhinosaurus, we think that, that horn could have been made of either hair or keratin like our fingernails and that stuff decomposes when the animal dies.

　　在几乎所有的已知恐龙里，它们的角都是骨质的，不过对于肿鼻角龙，我们认为它的角要么是毛发构成的要么是像指甲那样的角蛋白，在动物死去后，那些物质会腐烂分解掉。

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　　A closer study of a modern rhinoceros would reveal that their horns attach differently to the skull than they did in Pachyrhinosaurus.

　　对现代犀牛的进一步研究表明了它们的角与头颅的连接方式与肿鼻角龙的并不一样。

　　We actually got specimens of rhinoceros that had passed away in zoos and looked very closely at exactly how the horn attaches to the bone.

　　我们分析了在动物园里死去犀牛的标本，仔细地研究了它们的角与骨头连接的方式。

　　The result of that shows that the structure that we see here in this rhino is actually not what we find in Pachyrhinosaurus.It's a very different kind of structure.

　　结果表明我们在这头犀牛这里看到的结构其实和在肿鼻角龙身上看到的不同。是两种区别很大的结构。

　　Behind the boss, protecting the neck and shoulders, Pachyrhinosaurus sported its other distinguishing feature, a bony headdress called a frill.

　　在圆凸后面，肿鼻角龙还有另一个独特的结构保护着颈部和肩部，一个骨质的头饰，称为褶边。

　　The frills were clearly functional because, I mean, this was something that was passed on from generation to generation.

　　褶边显然有用，因为这个可是一代代遗传下来的。

　　It may have started off as a species recognition, sexual display mechanism, but both male and female have it, so I'm sure in the end it helped in terms of protection.

　　可能一开始是种类区分、性别展示手段，但是雌性和雄性都有，所以我认为它肯定有保护作用。

　　If you're going to bring down a Ceratopsian, you're not going to be able to get it by the neck because there's nothing to grab on there but solid bone, that's this thick.

　　要是想放倒一头肿鼻角龙的话，那么从颈部下手肯定不行，因为那里没有可以抓住的东西，除了坚硬的骨头，那骨头有这么厚。

　　By studying the bones at the site, paleontologists found another clue.

　　通过对化石场的骨头进行研究，古生物学家们发现了另一线索。

　　This herd consisted of all ages from the very young to full grown adults.

　　这群恐龙中，从非常幼小的到完全成年的，各种年龄段都有。

　　This cross section gave clues of how the Arctic dinosaurs' horn physically changed as they got older.

　　这一情况能让我们知道北极恐龙的角在物理上如何随着年龄增长而变化。

　　One of the things that's really interesting when we look at these nasal bosses in these different Pachyrhinosaurs is that no two are alike, they're all different.

　　我们在观察不同肿鼻角龙的鼻部圆凸时，确实有趣的事情之一是，没有哪两个是相似的，它们全都不一样。

　　That difference would tell a lot potentially about the animal's age, maybe about its sex, but also about its general health.

　　那个区别能告诉我们很多信息，可能关于动物的年龄，也许能表明它的性别，但也许也关于它的大致健康情况。

　　These are all the kinds of parameters that animals are using to judge, whether it's a female judging a potential father for her children or potentially males sizing each other up for battle.

　　这些都是动物们相互判断时所使用的参考量，不管是雌性在选择未来孩子的父亲还是雄性在战斗时相互估量。