项目成本管理是一个复杂的系统工程，是一个动态管理过程。
Project cost management is a complex system engineering. It is a dynamic process.
建筑施工安全管理是动态管理，是一项复杂的系统工程。
Safety management in construction is a dynamic and complex system engineering.
建筑施工安全管理是动态管理，是一项复杂的系统工程。
Safety management in construction is a dynamic and complex system engineering.
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