一个超线程（一个模具上有两个处理器核心）Intel P4 的内存壁垒性能（memory barrier performance）要快于两个 P4，而两者的性能特征又不同于 Sparc。
The memory barrier performance of a single Intel P4 with hyperthreading (two processor cores on one die) is faster than with two P4s, and both have different performance characteristics than Sparc.
提出了模具设计实例特征描述模型和实例的框架表示。
A feature description and frame representation of designing cases is given.
并建立了接触特征空间和模具曲面网格的对应关系。
And relations between Contact Feature Space and tools' surface meshes are established.
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