But this all changed when Bruno, another hadrosaur of the same species was discovered.

但相同物种的另一只鸭嘴发掘后，这一切都改变了。

Back in 1994, in Trieste, a municipality in North Eastern Italy, scientists discovered Antonio - a small hadrosaur, or duck-billed dinosaur.

回到1994年，在意大利东北部城市的里雅斯特，科学家们发现了“安东尼奥”——一只小型鸭嘴。

Many hadrosaur fossils have been found in the same area.

许多鸭嘴化石在同一地区发现。

Nathan had discovered a young hadrosaur, a duck bill dinosaur that lived in that area long ago.

内森发现了一只年轻的鸭嘴，这是一种很以前生活在那片区域的鸭嘴。

Triceratops and triceratops and the hadrosaur Corythosaurus are the two animals that have a dental battery.

三角和三角以及鸭嘴冠是两种拥有牙科电池的动物。

This is a cross section of a hadrosaur jaw.

这是鸭嘴下颚的横截面。

The hadrosaur Edmontosaurus got dramatically larger with age and so did Camarasaurus, an herbivore that lived in the Jurassic Period.

随着年龄的增长， 鸭嘴埃德蒙顿变大，生活在侏罗纪时期的食草动物圆顶也是如此。

Let's take a moment to compare the jaws of mammalian herbivores with the hadrosaur jaw.

让我们花点时间比较一下食草哺乳动物的下颚与鸭嘴的下颚。

This is a hadrosaur tooth, which would have been closely packed in with hundreds of others to form the dental battery.

这是一颗鸭嘴牙齿，本可以与数百颗其他牙齿紧密排列在一起形成牙科电池。

That was when paleontologists studied the trackways of hadrosaurs.

那是古生物学家研究鸭嘴足迹的时候。

In hadrosaurs, the grinding surfaces are almost horizontal, meaning that the jaws are moving from side to side and forward and backward.

在鸭嘴中，磨削面几乎是水平的，这意味着颌骨会左右移动，前后移动。

Some groups of dinosaurs, probably devoted a lot of time to care for their young, like theropods and hadrosaurs.

有些群体，可能会花很多时间照顾它们的幼崽，比如兽脚类和鸭嘴。

Take for example, the footprints of hadrosaurs.

以鸭嘴的足迹为例。

All the skulls have a wide beak and modified dental battery, characteristic of hadrosaurs.

所有的头骨都有一个宽大的喙和改良的牙套，这是鸭嘴的特征。

So, in a sprint, a tyrannosaur would definitely outpace a hadrosaur.

因此，在短跑中，霸王肯定会超过鸭嘴。

But in a marathon, the slower, but steadier hadrosaur would win the race.

但在马拉松比赛中，速度较慢但更稳定的鸭嘴将赢比赛。

If you remember, I mentioned earlier, that the old view of hadrosaurs had them standing almost upright, on their hind limbs.

如果你还记的话，我之前提到过，鸭嘴的旧观点认为它们几乎直立，用后肢站立。

And therefore, we know that dental batteries evolved independently in hadrosaurs and ceratopsians, a great example of convergent evolution.

因此，我们知道牙科电池在鸭嘴和角中独立进化，这是趋同进化的一个很好的例子。

On the other hand, the hadrosaur was probably not capable of taking long strides and wouldn't have been able to swing its leg as quickly.

另一方面，鸭嘴可能无法大步走，也无法快速摆动腿。

Here, we have a complete hadrosaur tooth.

在这里，我们有一颗完整的鸭嘴牙齿。