The time and place of the sigma factors appearance have connection with two morphogenetic changes.

各sigma因子出现的时间与地点都与这两个形态结构的变化紧密相连.

These factors are all have connection with social capital except for material base and cultural environment.

而在这些因素中，除了城市方面的物质基础和文化环境，基本都和社会资本有一定的联系。