它通过榜样的力量、群体心理环境和躬身实践形成；
It is formed by the power of examples, mass psychological environment and personal practice.
在这种严酷环境中生存的人类群体必须具备特殊的身体素质、心理素质和生存技巧。
Human population that lives in this rigorous environment must possess some special physical and psychological diatheses and survival skills.
结论：除个别特殊物理环境下的工人外，不同工人群体的心理健康基本正常。
Conclusion: the mental health of these samples were basically normal except a few that were in special physical environments.
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