求翻译：如果两个变量都不存在单位根，则都是平稳的时间序列，就可以通过一般的回归分析研究它们之间的相关性；如果两个序列存在单位根但阶数不同，则说明两个变量之间不存在相关关系；如果两个序列都存在单位根，并且阶数相同，则需要进行协整关系检验。对于有些时间序列，虽然它们自身是非平稳的，但其某种线性组合却是平稳的，这种稳定性的线性组合被称为协整方程，可以解释为变量的长期均衡关系。两个变量的协整检验要求它们是同阶单整的。因此，在检验变量关系前，我们必须首先进行单位根检验。是什么意思？

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If two variables are not present, everything is 单位根 smooth time-series, it can be a general study of the regression analysis between them; if the relevance of two sequences, but there are number of steps 单位根 different, the two variables do not exist between the relationship between two sequences; if

If two variables both do not have the unit root, then all is the steady time series, may study between them through the general regression analysis the relevance; But if two sequence existence unit root the exponent number is different, then explained between two variables does not have the correlat

If two variables do not exist, you are stationary time series, you can through the regression analysis on the correlation between them; there is a unit root but if two sequences order different, then there is no correlation between two variables; there is a unit root if two sequences, and order the

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