有许多因素可以定义的中产阶级的社会中，如金钱，行为和遗传。
There are many factors that can define the middle class in a society, such as money, behaviour and heredity.
因为好斗的个体更有可能生存和繁殖，所以任何与好斗行为相关的基因都更有可能遗传给后代。
Because aggressive individuals are more likely to survive and reproduce, whatever genes are linked to aggressive behavior are more likely to be transmitted to subsequent generations.
后来随着马克思思想中的人类易受影响性和可完善性观点的流行，它和遗传决定人类行为观点一样不受大家庞爱。
It then fell out of favour, along with the idea that behaviour is genetically determined, as Marxist ideas of the pliability and perfectibility of mankind became fashionable.
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