While the basic process and the fundamentals of control are universal, the actual system requires special design. 尽管控制的基本过程和基础是通用的，但实际系统须特别设计。
The evolution process of gemstone cut and its developmental trend are vividly introduced with pictures in this paper. 以图文并茂的形式介绍了宝石琢型发展演化的基本过程以及宝石琢型的发展趋势。
