该模型分为五个层，即：环境支持层、运行平台支持层、物理管理层、映射层和应用层，并具体讨论了每一层的功能和开发方法。
The model consists of five layers which are environment support layer, running platform support layer, physical management layer, mapping layer, and application layer.
由于本系统只限于应用层程序的探讨，所以对具体的压缩算法不做深究。
Because this system is limited to application layer discussion, so do go into the specific compression algorithm.
由于本系统只限于应用层程序的探讨，所以对具体的压缩算法不做深究。
Because this system is limited to application layer discussion, so do go into the specific compression algorithm.
应用推荐