唯物主义认为,人类的生产有两种:物质生活资料的生产和人类自身的生产。在原始时代,社会生产力水平极为低下,人们在从事物质资料生产活动中,常常遭受各种自然力的威胁和袭击,出现一批又一批氏族成员的死亡,为了战肚自然灾害,氏族急需增加人数,补充或扩大队伍,同时,氏族之间、部落之间 Materialism holds that there are two kinds of human production: the production of material living materials and the production of human beings themselves. In primitive times, the level of social productivity was extremely low. People engaged in the production of material information were often threatened and attacked by various forces of nature and the death of a group of clan members emerged. In order to ward off natural disasters, the clan urgently needed to increase the number of people , Supplement or expand the team, at the same time, between clans, tribes