传统的计算机辅助工艺规划系统都是二维的，目前国内外尚无成熟的三维数字化装配工艺系统出现。
The traditional computer aided process planning systems are two-dimensional, and now there aren 't commercial three-dimensional digital assembly process planning systems.
目前国内外的相关研究主要集中于对传统的二维地图和固定地图的研究，对三维虚拟地图和可旋转地图的研究还相对较少。
Current and relevant research focused mainly on the traditional two-dimensional maps and static map, and study to three-dimensional virtual map and rotated map relatively less.
目前国内外的相关研究主要集中于对传统的二维地图和固定地图的研究，对三维虚拟地图和可旋转地图的研究还相对较少。
Current and relevant research focused mainly on the traditional two-dimensional maps and static map, and study to three-dimensional virtual map and rotated map relatively less.
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