宏观经济系统是包括一个国家的整体经济运行状况的巨系统。
Macroeconomic system is a huge system including the economic situation in the whole country.
宏观经济系统是一个复杂的非线性系统，对宏观经济进行预测应采用非线性的工具进行建模。
Macroeconomic system is a complex nonlinear system. The non-linear tools should be used in macroeconomic models.
由于宏观经济系统是一个大型复杂系统，存在着非线性、时滞和时变，因此建立一个实用的宏观经济模型并不容易。
Because macroeconomic system is a big complicated system and it exists nonlinear, time lag and time change, it is difficult to establish a applied macroeconomic model.
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