Well, the last of the metriorhynchids lived in the Early Cretaceous.

好吧，最后的 metriorhynchids 生活在早白垩世。

While dinosaurs were dominating the land, the metriorhynchids were thriving in the seas.

当恐龙统治着陆地时，metriorhynchids 在海洋中繁衍生息。

So this is where yet another adaptation came in for marine reptiles like the metriorhynchids.

所以这就是对像 metriorhynchids 这样的海洋爬行动物进行另一种适应的地方。

But by sorting out all these distractions, the metriorhynchids may have been able to hear more clearly underwater and zero-in on their targets.

但通过排除所有这些干扰因素，metriorhynchids 可能已经能够在水下更清楚地听到它们的目标并归零。

Now, for a while, even though we knew that metriorhynchids were secondarily aquatic, we weren't really sure how this transition back to the water happened.

现在，有一段时间， 即使我们知道 metriorhynchids 次要水生，我们也不确定这种回到水里的转变是如何发生的。

Ok, now that the metriorhynchids have solved allll the problems of swimming, breathing, and eating, what if they wanted to have kids -- yknow little metriorhyn-kids?

好的， 现在 metriorhynchids 已经解决了游泳、呼吸和进食的所有问题，如果他们想要孩子怎么办——你知道小 metriorhyn 孩子吗？

Mosasaurs, for example, descended from terrestrial lizards similar to modern day monitor lizards, while the ancestors of the metriorhynchids were croc-relatives that lived on land!

例如， 沧龙是类似于现代巨蜥的陆生蜥蜴的后代，而后喙龙的祖先是生活在陆地上的鳄鱼亲戚！

And, unlike their terrestrial relatives, true metriorhynchids had no osteoderms, which are bony structures in the skin that help provide protection and can help regulate body temperature.

而且，与它们的陆生亲属不同，真正的后嘴龙没有真皮，这是皮肤中的骨结构， 有助于提供保护并有助于调节体温。

Now, Aggiosaurus was just one member of a larger family of aquatic reptiles called metriorhynchids that lived from the Middle Jurassic to the Early Cretaceous Period.

现在，凶龙只是生活在侏罗纪中期到白垩纪早期的一个更大的水生爬行动物家族的一员，这个家族叫做 metriorhynchids。

But, even though the metriorhynchids and other large marine reptiles like mosasaurs aren't around anymore, there are still marine reptiles alive today; there are just fewer of them and they're less diverse than they used to be.

但是，即使 metriorhynchids 和其他大型海洋爬行动物（如沧龙）不复存在，今天仍然有海洋爬行动物存活；它们的数量越来越少， 而且不像以前那样多样化。