第一章说明研究背景和意义，并划定研究范围，构建研究框架；
Study background, significance, scope and framework were presented in the first chapter.
作者提出了一种新的研究体系，来勾画它的轮廓，构建它的框架。
The authors propose a new research system to draw its outline and construct its framework.
笔者从数字工程提出的背景和研究意义入手，构建了数字工程基础理论框架。
The author started with background and research significance of digital engineering given, and constructed the fundamental theory frame of digital engineering.
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