Although many lines of evidence indicate that birds evolved from ground-dwelling theropod dinosaurs, some scientists remain unconvinced.
尽管有许多证据表明鸟类是从陆生兽脚亚目恐龙进化而来的，但一些科学家仍然表示怀疑。
Raptors look quite a bit like dinosaurs but they have much more in common with birds than they do with other theropod dinosaurs such as Tyrannosaurus.
迅猛龙看起来有点像恐龙，但是它们与其他兽脚类恐龙比如暴龙相比，与鸟类更相似。
Theropod dinosaurs did not share this feature.
兽脚类恐龙(theropod dinosaur)没有这一特征。
But many theropod dinosaurs have ambiguous features, such as peg-like teeth at the front of the mouth, or no teeth at all.
但是，许多食肉恐龙的特征并不是很明显，例如：要么在嘴的前部有“钉状牙齿”，要么就根本没有牙齿。
"Raptors look quite a bit like dinosaurs but they have much more in common with birds than they do with other theropod dinosaurs such as Tyrannosaurus," Ruben said.
“迅猛龙（raptor）看起来有点像恐龙，但是它们与其他兽脚类恐龙（theopod dinosaur）比如暴龙（Tyrannosaurus）相比，与鸟类更相似，”鲁本说。
"Raptors look quite a bit like dinosaurs but they have much more in common with birds than they do with other theropod dinosaurs such as Tyrannosaurus, " Ruben said.
“迅猛龙（raptor）看起来有点像恐龙，但是它们与其他兽脚类恐龙（theopod dinosaur）比如暴龙（Tyrannosaurus）相比，与鸟类更相似，”鲁本说。
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。
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。
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