介绍了虚拟用户交换机的产生及其应用，讨论了与传统的用户交换机在提供业务、使用维护等方面的不同之处。
This paper introduces the virtual PBX and its application, also discusses the difference between traditional PBX and virtual PBX in respect of support service and maintenance.
因为Linux显示文件系统的一个公共界面(通过虚拟文件系统交换机[VFS])，Ceph的用户透视图就是透明的。
As Linux presents a common interface to the file systems (through the virtual file system switch [VFS]), the user's perspective of Ceph is transparent.
因为Linux显示文件系统的一个公共界面(通过虚拟文件系统交换机[VFS])，Ceph的用户透视图就是透明的。
As Linux presents a common interface to the file systems (through the virtual file system switch [VFS]), the user's perspective of Ceph is transparent.
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