最小的、社交最少的、且政治体系最不复杂的人类团体，我们称之为群体。
The human groups that are the smallest and have the least social and political complexity, we call bands.
当你生活在群体当中时，便是一种团体生存，而不是一场个人的战斗。
When you live in groups, you're surviving [together], it's not an individual battle against others.
这些团体提供成文材料教育健康专家和大众群体。
These groups provide written materials for the education of health professionals and the lay public.
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