The transformation of map projection is the base for mapping theory and an important component of GIS.
地图投影变换是地图制图理论的基础，也是GIS的重要组成部分。
With key component parts of engine and chassis as its major products, Dongfeng Auto Industrial Town is an important base of Dongfeng Auto Company in South China.
东风汽车工业城主要生产发动机及底盘的关键零部件，是东风汽车南方主要基地之一。
Parts Library is an important component of the CAD system, and it is the base of computer-aided design and manufacturing, computer data integration, and advanced manufacturing technology.
零件库是CAD系统的重要组成部分，是实现计算机辅助设计与制造、计算机数据集成、先进制造等技术的基础。
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