在软件再生工程中为了有效利用遗产系统提供现实可行途径，对原系统理解是关键。
Reengineering offers a practical and feasible approach to use legacy system. Understanding the old system is of vital importance for its implementation.
软件再生工程中的逆向工程是指对现有系统进行分析，以最大的努力去建立比代码抽象层次更高的表达形式。
The converse project of the software regeneration project means to analyze the present system and to build a higher expressive form than code abstract level.
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