The result, once natural selection had done its work over the course of millions of years, was the now familiar cast of Allosaurus and Tyrannosaurus rex.
结果，历经数百万年间的自然选择，形成了我们今日熟知的异特龙和雷克斯霸王龙族群。
Allosaurus was a powerful predator that walked on two powerful legs, had a strong tail. The Allosaurus hunted in groups.
异特龙是个凶猛的捕食者，它有着强劲的后腿和健壮的尾巴，捕猎时是成群出击。
Suggestions that they were the direct descendants of theropod dinosaurs (a group of bipedal meat-eaters that include Allosaurus, Velociraptor and Tyrannosaurus) caused quite a flap.
有人说它是兽脚恐龙的后代（兽脚恐龙是一群食肉的两足恐龙，其中包括异龙、迅猛龙与暴龙），这引起了学界很大的注意。
The result, once natural selection had done its work over the course of millions of years, was the now familiar cast of Allosaurus, Diplodocus, Triceratops and Tyrannosaurus rex.
结果，历经数百万年间的自然选择，形成了我们今日熟知的异特龙、梁龙、三角龙和霸王龙族群。
The result, once natural selection had done its work over the course of millions of years, was the now familiar cast of Allosaurus, Diplodocus, Triceratops and Tyrannosaurus rex.
结果，历经数百万年间的自然选择，形成了我们今日熟知的异特龙、梁龙、三角龙和霸王龙族群。
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