Some are from the same clan as Deinonychus; others are from more primitive groups like Oviraptors and Tyrannosaurs.
有些与恐爪龙属于同一氏族;有些则来自恐爪龙。其他的则来自更原始的群体,如偷蛋龙和暴龙。
英语百科
Primitive permutation group
(重定向自Primitive group)
In mathematics, a permutation group G acting on a set X is called primitive if G acts transitively on X and G preserves no nontrivial partition of X. (The hypothesis of transitivity can be dropped if .) Otherwise, if G is transitive and G does preserve a nontrivial partition, G is called imprimitive.