or.tho.gen.e.sis
n.（名词）Biology The theory that the evolution of a species is influenced most strongly by internal factors and is not subject to the external forces of natural selection.【生物学】 直向进化论：关于物种的进化是受内部因素的强烈影响而非外部自然选择的影响的理论The theory that all cultures pass through sequential periods in the same order.直向演化论：关于所有文化都以相同的顺序经过一系列时期演化而成的理论
【引伸】
or.thogenet.ic
or.thogenet.ically
adv.（副词）
