过去,人们曾普遍认为,出现在三叠纪后期的恐龙迅速取代了比其更为古老的物种。但最近,美国的一项最新研究成果却指出,恐龙曾与其祖先在地球上共存长达数百万年之久。 In the past, it was generally believed that the dinosaurs that emerged in the late Triassic quickly replaced the more ancient ones. Recently, however, a new study in the United States has pointed out that dinosaurs have lived on Earth with their ancestors for millions of years.