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.

youdao

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.

youdao