Individual layers generally have sharp contacts.
单层间一般具有截然的接触带。
Instead, keep these layers in different directory trees and use individual link files for each.
不过需要将这些层存贮在不同的目录树下，并且每层使用单独的链接文件。
Each individual process belongs to one of the layers.
每个流程都属于其中一个层。
Each individual process belongs to one of the layers.
每个流程都属于其中一个层。
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