求翻译：为了解释不同国家，同一国家不同时期经济表现存在差异的现象，宏观经济学家致力于考察宏观经济政策的实施过程和对经济的影响。是什么意思？

In order to explain the different countries, different periods of the same country differences in economic performance phenomenon, macroeconomists devoted study and implementation of macroeconomic policies on the economy.

In order to explain that different countries with different periods a state economic performance differences between macro-economists, is committed to examining the implementation of macroeconomic policies and the impact on our economy.

In order to explain the different country, the identical national different time economy performance existence difference phenomenon, the macroscopic economist devotes to the inspection macroeconomic policy implementation process and to the economy the influence.

In order to explain the different countries, differences in economic performance in different periods of the same country, macro-economists to examine the implementation of macroeconomic policies and economic implications.

In order to explain the different country, the identical national different time economy performance existence difference phenomenon, the macroscopic economist devotes to the inspection macroeconomic policy implementation process and to the economy the influence.