Being able to begin your software development efforts by outlining system behaviour via a use case diagram really helps you create a quality application architecture and design.

可以通过用例，略述系统行为就可以开展软件开发，并帮你创建高质量的应用程序体系结构与设计。

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The development method of the process flow diagram (PFD) is based on a new design method of process flow diagram, adopted in the international companies in recent years.

工艺流程图(PFD)的扩展方法，是国际工程公司近年采用的一种新的工艺流程设计方法。

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Design and development of the mechanical systems, compose schematic diagram; assembly drawing and part drawing; testing on production etc.

产品机械设备的设计开发，包括完成产品原理图、装配图、零件图的设计、产品零部件选型和测试等；

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