某种自然灾害致使该地区的恐龙群死亡。
Some natural disaster killed a whole herd of dinosaurs in the area.
这一类群，包括像剑龙和三角龙这样有名的名字，是恐龙被分成的两个分支之一。
This group, which includes such famous names as Stegosaurus and Triceratops, is one of the two clades into which the dinosaurs are divided.
几十年来，古生物学家们已经知道了一群被称为蜥脚类动物的恐龙的起源和结局。
Paleontologists have known for decades about the beginnings and endings of a group of dinosaurs known as the Sauropodomorpha.
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