两层分离是指管理层与作业层不再具有行政隶属关系,而是不同利益主体的经济合作关系；
两层的方法将数据存储和数据访问管理相分离。
The two-tier approach isolates data store and data access management.
折叠的屏障用于分离房间和露台，它们可以完全地被打开，加强住宅两层的联系。
Folding screens used to separate rooms from the terraces can be opened up completely to enhance the connection between the house's two levels.
为了避免将代理商选择和线路优化作为两个互相分离的子问题来处理，提出了求解它的两层邻域搜索算法。
We propose a two layers neighborhood search algorithm to avoid the separation between agent choices and road optimization.
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