However, it can take a long time to learn and understand data management in SAS and many complex data management tasks can be done using simpler commands in Stata or SPSS.
可是学习掌握SAS数据管理需要花费很长时间，而且许多复杂的数据管理任务在Stata或者SPSS中只需要用简单的命令即可完成。
However, it can take a long time to learn and understand data management in SAS and many complex data management tasks can be done using simpler commands in Stata or SPSS.
可是学习掌握SAS数据管理需要花费很长时间，而且许多复杂的数据管理任务在Stata或者SPSS中只需要用简单的命令即可完成。
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