在少年儿童中间,曾经流行过一个争论的问题:世界上是先有鸡,还是先有蛋?这个争论当然是没有结果的,但它的实质,牵涉到鸡——也就是鸟类,是如何进化来的。不久前,我国古脊椎动物专家徐星博士发表论文认为,1996年由中国、美国和加拿大三国学者在辽西发现的中国猎龙化石,表明它具 Among children and children, there has been a debate over the issue of whether the world has chickens or eggs first. The controversy is, of course, inconclusive, but its essence involves chickens, that is, birds. Evolutionary. Not long ago, Dr. Xu Xing, an expert on ancient vertebrates in China, published a paper arguing that in 1996 China, the United States and Canada’s scholars discovered the fossils of Chinese dragon hunting in western Liaoning, indicating that it