It's been named Khankhuuluu mongoliensis, which means 'Dragon Prince of Mongolia', and the University of Calgary scientists say that this species is a window into how tyrannosaurus evolved to become the powerful predators that terrorised North America and Asia until the end of the reign of the dinosaurs. 

这个新物种被命名为 “蒙古汗库鲁龙”，意思是 “蒙古龙王子”。卡尔加里大学的科学家们表示，这一物种为我们打开了一扇了解暴龙属是如何进化成为强大捕食者的窗口，它们曾统治着北美和亚洲大陆直至恐龙时代结束。 

While the most famous tyrannosaur is the giant T. rex, fossils show that the earliest animals in this superfamily of dinosaurs were actually very small – fleet-footed hunters that scampered after rat-sized prey. 

虽然最著名的暴龙属是巨大的霸王龙，但化石显示出暴龙超科中最早的成员实际上体型很小，它们是迅捷的猎手，会用轻快的步伐追捕老鼠大小的猎物。 

But this newly identified horse-sized dinosaur represents an important evolutionary shift. The 86-million-year-old skeleton also shows early evolutionary stages of features that were key to tyrannosaur's domination as apex predators, including long hind limbs and powerful jaws. 

但这个新发现的、马匹大小的恐龙代表了生物进化中一次重要的转折。这具 8600 万年前的骨骼还显示了许多处于早期进化阶段的特征，这些特征是暴龙属作为顶级捕食者称霸的关键，其中包括修长的后肢和强有力的下颚。