the alternation of two or more different forms in the life cycle of a plant or animal
同义词：alternation of generations, heterogenesis
xenogenesis详细解释
xen.o.gen.e.sis
n.（名词） The supposed production of offspring markedly different from either parent. 异种生殖：生出与父母体完全不同的机体的假想 See alternation of generations 参见 alternation of generations
