Plesiosaurs were marine reptiles that co-existed with dinosaurs.

蛇颈龙是海洋爬行动物，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。

At sea, though, the most abundant reptiles were the ichthyosaurs and plesiosaurs.

但是在海里，最繁盛的爬行动物要属鱼龙和蛇颈龙了。

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

数年来，古生物学家一直想知道蛇颈龙是否也通过怀胎方式繁殖后代。

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。

It's hoped it will help unravel the evolution of long-necked plesiosaurs in Australia.

人们希望这个发现能有助于解开澳大利亚长颈的蛇颈龙进化过程之秘。

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2亿多年前的海洋中。

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。

Instead, Dr O'Keefe believes he has discovered evidence that plesiosaurs, too, gave birth to live young.

反过来，奥基夫博士相信他已发现了蛇颈龙同样靠胎生繁殖的证据。

It was said to be a sort of plesiosaur, somehow stranded in the loch from 65m years ago.

据说这是蛇颈龙的一种，六千五百万年前由于某种原因在此搁浅。