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这是一种兽脚亚目肉食恐龙。The type of dinosaur that was found is known as a theropod.

但这并不能完全解释兽脚亚目食肉恐龙的缺位。But that does not completely explain the absence of theropod tracks.

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这种结构最终被证实是极其原始的羽毛——且存在于陆生的兽脚亚目恐龙身上。At last there was evidence of truly primitive feathers—found on a ground-running theropod.

在那样一种环境下，即便是一头巨大的兽脚亚目食肉恐龙也会不时回头张望。In that sort of environment even a big theropod would constantly have been looking over its shoulder.

然而，这个兽足类巨大化理论最有力的支持，却来自对霸王龙身世的了解。The strongest support for this theory of theropod gigantism comes from what is known about the rise of T. rex, however.

古生物学家正在对鸟类的兽脚亚目最近亲进行仔细研究，以寻找这种转化的线索。Paleontologists are now carefully studying the closest theropod relatives of birds for clues to how this transition occurred.

而现在我们则必须承认，所谓的鸟类是指一群有羽毛、演化出飞翔能力的兽足类恐龙。Now we must acknowledge that birds are a group of the feathered theropod dinosaurs that evolved the capacity of powered flight.

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它属于驰龙科一员，是一种类似鸟类的兽脚亚目食肉恐龙，在白垩纪繁盛一时。A member of the Dromaeosauridae of dinosaurs, it was a bird-like theropod dinosaur, which flourished during the Cretaceous Period.

鸟类可以说是一种长着特化的翅膀，能够飞翔的兽脚类恐龙。Birds are really a kind of specialised winged and flying theropod dinosaur, " said Professor Jose Sanz of the Universidad Autonoma de Madrid."

古生物学家认为这两种食肉类恐龙轻巧、灵活、速度快，而且每个蹄子有三个巨大锋利的爪子。Paleontologists believe the meat-eating theropod dinosaur was light, agile and very fleet of foot, with three large slashing claws on each hand.

这样的鳄鱼，在整个生态系统中很轻松的扮演着顶级杀手的角色。Such megacrocs, then, could easily have acted as top predators in this ecosystem. But that does not completely explain the absence of theropod tracks.

本文记述了河南省义马县中侏罗世地层中首次发现的大型兽脚类恐龙足印。Herein described is the first discovery of large sized theropod dinosaur footprints from the Middle Jurassic deposits of Yima, Henan Province of China.

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可能已经是时候最终接受‘始祖鸟’只是又一只在侏罗纪时期飞来飞去的长有羽毛的像鸟类的小兽脚亚目食肉恐龙了。Perhaps the time has come to finally accept that archaeopteryx was just another small, feathered, bird-like theropod fluttering around in the Jurassic.

无论如何，从那时开始，科学家已经找到了一定数量的保存完好的，拥有类似羽毛结构的兽脚亚目恐龙化石，这种结构和羽毛绒还有羽毛叶片符合得很好。Since then, however, scientists have found a number of well-preserved theropod fossils with many more featherlike structures, corresponding to downy feathers and feathers with vanes.

这块化石的发现不仅在鸟类起源研究领域，而且在羽毛的发生和演化和飞行起源等方面均具有重要科学价值。The feathered theropod dinosaur is of great importance to scientific studies on origin and early evolution of bird, origin and early evolution of feathers as well as origin of bird' s flight.

发掘现场出土的动物化石揭示出，鳄踝初龙的数量出现急剧下降，而随着兽脚类恐龙在数量和体形上的扩展，它们的足迹也开始变得更大、更普遍。Animal fossils uncovered at the sites revealed a sharp fall in the population of crurotarsans, while theropod footprints became larger and more common as the dinosaurs grew in number and size.

同时，这些惊人的化石使得「到底怎麽样才算是鸟类」需要重新定义，而兽足类恐龙的生物学与生活史也得重新讨论了。The consequence of these amazing fossil finds has been a simultaneous redefinition of what it means to be a bird and a reconsideration of the biology and life history of the theropod dinosaurs.