表示学习曲线效应的规则是做一个任务的次数越多，每次重复所需的时间越少。
The rule used for representing the learning curve effect states that the more times a task has been performed, the less time will be required on each subsequent iteration.
按点-线-面的层次数据结构，选取几种有代表性的曲线曲面，实现了三维复杂外形的表面描述。
Based on a point line patch hierarchical data structure, three dimensional complex geometries are described by several typical kinds of surface patches.
本文利用最佳端焦耦合法对交叉光波导的损耗特性进行了测量和研究，绘制了波导损耗随交叉次数和交叉角的变化曲线。
The characteristic curves of the waveguide loss versus the number of transpositions and crossing angle are drawn out, which conform to the expcted loss characteristics of crossed optical waveguide.
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