Railway transportation system is a complex system, and it is greatly influenced by national economy.
铁路运输是一个复杂的系统，国民经济对其有巨大影响。
Thus, The National Economy Mobilization (NEM) is a complex project of systems engineering.
因此，国民经济动员工作是一项复杂的系统工程。
Thus, National Economy work is a complex system engineering project.
因此，国民经济动员工作是一项复杂的系统工程。
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