然而，学界一直缺乏对它具体过程的细致的实证的考察分析。
However, up to now, we have still lacked the positive analysis on the practical course.
本文的不足之处是缺乏对这一问题进行实证分析。
This paper is the inadequacy of the lack of empirical analysis of this issue.
其次，本文在实证材料的支撑上比较薄弱，缺乏更新的、更全面的实证分析成果。
Next, this article lacks the real diagnosis material's support, lacks the renewal and the more comprehensive empirical analysis achievement.
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