Sea monsters like the mosasaur were real.

像 Dreadnoughtus 一样的恐龙是真实存在的。

Could the mosasaur have survived the great extinction?

沧龙能在大灭绝中活下来吗？

And others believed that snakes evolved fromthe mosasaurs, giant swimming lizards that lived 144 to 65 million years ago.

另一些科学家认为蛇由沧龙进化而来，沧龙是生活在一亿四千四百万年前至六千五百万年前的一种巨型水生蜥蜴。

And here's what would happen if mosasaurs were still alive?

我们一起来看看，如果沧龙还活着会是什么情况？

Except it's difficult to analyze the genes of the extinct mosasaurs.

分析已经灭绝的沧龙的基因是非常困难的。

Among the likely creatures to have laid it are species of mosasaurs and plesiosaurs.

沧龙和蛇颈龙是可能产下此蛋的生物。

Its predators include mosasaurs and plesiosaurs, large water creatures up to 15 meters in length.

它的捕食者包括沧龙和蛇颈龙，这是一种体长可达15米的大型水生物。

Other aquatic creatures  of the time like the plesiosaurs and mosasaurs are technically not dinosaurs.

当时的其他水生生物，如蛇颈龙和沧龙，严格来说并不是恐龙。

Mosasaurs like this Clidastes were reptilian relatives of modern monitor lizards and snakes.

像这种 Clidastes 这样的沧龙是现代巨蜥和蛇的爬行动物亲戚。

They probably remind you of animals like mosasaurs, ichthyosaurs, and plesiosaurs.

它们可能会让您想起沧龙、鱼龙和蛇颈龙等动物。