可在字符串中使用伪列LEVEL，使分层结构变得可视。
The pseudo column LEVEL is used in a string to make the hierarchy visible.
该算法使分层递阶约简算法从简单的属性分层处理拓展至属性选择和属性压缩处理。
This hierarchical reduction approach extends the simple classified attributes reduction to attributes selection and attributes reduction.
文中考虑了材料的相对导磁系数对材料复数折射率的贡献，使分层介质系统的光学迭代法更具普遍性；
The optical recursive formula for stratified medium system becomes more general with the contribution of relative magnetic permeability to the complex refractive index.
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