But most conventional CAD systems are in single form, and they have much inherent limitation such as long period of product-design, bad resource sharing, hard management and low openness.
但传统的CAD系统多以单独系统设计为主要形式，具有产品设计开发周期长、资源共享性低、管理维护困难、开放性差等固有局限性。
The time spent on human computer interaction is greatly reduced during the design process, as a results the problem on how to shorten the long period of structure design is largely solved.
大幅度地减少了人机交互时间，解决了高速列车流线型结构实体造型过程中设计周期过长的问题。
The seismic response of the structure with long period will be over estimated, if the standard spectrum or the design spectrum given by seismic risk analysis is applied.
而长周期结构采用规范设计反应谱或由地震危险性分析给出的场地设计反应谱计算所得的地震反应结果偏大。
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