The interplay of EPMM system and Environment is the external power of EPMM system"s evolution."
系统的环境是系统演化的外因，系统与环境之间的相互作用是系统演化的外部动力；
Finally, the rule and general trend for evolution of EPMM system in BCE is discussed under the theory of productive forces and productive relations.
最后，运用生产力和生产关系原理分析建筑施工企业项目管理机制系统的演化规律和总体趋势。
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