非饱和水通过双层孔隙介质的渗流对于放射性废物近地表处置库的顶盖设计具有重要意义。
It is of very important significance to understand unsaturated water vadose through two layer porous media in design of cover of near surface repository of radioactive waste.
使用权限信息表和数据库用户共同控制权限，对数据做了双层保护。
Double protection to the data was realized with right information table and database user.
为了提高检索的效率，我们还提供了一个双层的语料库索引方法。
In order to raise the retrieval efficiency, we provide a two-level corpus indexing method.
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