There are few known fossil specimens of these ancient snakes and only three in which the hind limbs are preserved and visible.
这些古老蛇类的化石标本非常稀少，仅有的三个标本的后肢保存完好并可见。
There are few known fossil specimens of these ancient snakes, and only three in which the hind limbs are preserved and visible.
有关这些古老蛇类的化石标本非常稀少，仅有的三个标本的后肢是加工过并且可见的。
The University of Texas's digital library, known as Digimorph, for example, contains hundreds of specimens and nearly a terabyte of data.
例如，德克萨斯大学的被称做Digimorph的数字图书馆就包含几百种标本和接近1000G的数据资料。
It had been known since 1939 but only from mangled specimens dragged to the surface by nets.
它自1939年就已为人所知，但只是从缠在网上被拖到表面的残缺标本。
Most fossil specimens are little more than carbon impressions although distinctive shapes are known.
尽管清晰的形状已为人所知，但大多数化石标本只不过是炭质印痕。
It was finally known from energy consumption analysis of joints that, generally speaking, all specimens possessed good capability of energy consumption.
由搭接节点耗能分析可知，总体看来各试件具有良好的耗能能力。
The little information known has been mostly based on dead and dying specimens that were caught by commercial fishing boats or washed ashore.
已知的资料很少，大部分已经死亡，死亡的标本这是由商业渔船捕获或冲上岸。
The little information known has been mostly based on dead and dying specimens that were caught by commercial fishing boats or washed ashore.
已知的资料很少，大部分已经死亡，死亡的标本这是由商业渔船捕获或冲上岸。
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