They had flippers like a turtle and long necks like a giraffe.

蛇颈龙的鳍状肢有如乌龟，脖子长如长颈鹿。

Plesiosaurs were marine reptiles that co-existed with dinosaurs.

蛇颈龙爬行动物，它们与恐龙生活在同一时代。

Later, aged 22, Mary discovered the first plesiosaur skeleton.

后来，22 岁的玛丽发现了第一具蛇颈龙骨架。

They found that the plesiosaur lurked in the ocean more than 200 million years ago.

他们发现，这种蛇颈龙生活在2亿多年前的中。

That it was so heavy, and also alone, is of great interest.

蛇颈龙幼胎超重且单独的个体引起了古生物家的极大趣。

For years, palaeontologists have wondered if the same was true of plesiosaurs.

数年来，古生物家一直想知道蛇颈龙否也通过怀胎方式繁殖后代。

In front of their shoulders Plesiosaurs varied tremendously.

在他们的肩膀前面，蛇颈龙千差万别。

She discovered the first-ever plesiosaur remains, the first pterosaur fossil found in England.

她发现了第一块蛇颈龙遗骸，这在英国发现的第一块翼龙化石。

With a long neck and flippers, a plesiosaur could reach 15 meters in length which would actually match estimations of the sheer size of Nessie.

蛇颈龙有着长长的脖子和脚蹼，一只蛇颈龙可以达到15米之长，蛇颈龙的长度事实上可以与尼斯湖水怪的净长相匹配。

Now most Plesiosaurs had large chests and torsos, broad paddle shaped limbs, and relatively short tails.

现在大多数蛇颈龙都有大的胸部和躯干、宽阔的桨状四肢和相对较短的尾巴。

Ichthyosaurs, Plesiosaurs, and Mosasaurs are all more closely related to modern reptiles like lizards and snakes.

鱼龙、蛇颈龙和沧龙与蜥蜴和蛇等现代爬行动物的亲缘关系更为密切。

The plesiosaurus, a serpent with a cylindrical body and a short tail, has four flappers or paddles to act like oars.

蛇颈龙一种具有圆柱形身体和短尾巴的蛇，有四个拍板或桨， 就像桨一样。

And the subduction continued through the extinction of Kronosaurus, and later, that of all of the plesiosaurs at the end of the Cretaceous.

俯冲一直持续到克朗龙灭绝，然后白垩纪末期所有蛇颈龙的灭绝。

In the aftermath of the extinction at the end of the Cretaceous, diving predators like small mosasaurs and plesiosaurs were gone, so their ecological niches were suddenly open.

白垩纪末期大灭绝之后，小型沧龙、蛇颈龙等潜水食肉动物消失了，它们的生态位突然打开了。

Now, pliosaurs are a type of plesiosaur, an extinct order of marine reptiles, and it seems that they also hunted other plesiosaurs as well as turtles, ammonites, and basically anything that was smaller than it was.

现在， 上龙一种蛇颈龙，一种已灭绝的爬行动物，它们似乎也猎杀其他蛇颈龙以及龟、菊石，以及基本上任何比它小的东西。

Most Ichthyosaurus, Plesiosaurus, and Mosasaurus are the right size to have preyed on small and medium size fish, but some like the giant Pliosaur Plesiosaurs were true sea monsters with huge jaws and bodies over 18 meters long.

大多数鱼龙、蛇颈龙和沧龙的体型都适合捕食中小型鱼类，但有些像巨型蛇颈龙这样的巨型蛇颈龙真正的怪，拥有巨大的下颚和超过 18 米长的身体。

What the researchers could tell was that this creature was a marine reptile that would've been about 3 meters long and that it was likely a close relative of the sauropterygians, the group that includes plesiosaurs and pliosaurs.

研究人员可以判断的， 这种生物一种长约 3 米的爬行动物， 很可能蜥龙类的近亲，蜥龙类包括蛇颈龙和上龙类。