返祖現象 angolul

atavism [atavisms]▼(reappearance of an ancestral characteristic)
noun
[UK: ˈæ.tə.ˌvɪ.zəm] [US: ˈæ.tə.ˌvɪ.zəm]

atavistic▼(of the return of earlier, more primitive behavior)
adjective
[UK: ˌæ.tə.ˈvɪ.stɪk] [US: ˈæ.tə.ˌvɪ.stɪk]