virtual directory system

The virtual file system bridges the underlying disparate physical file system to the logical file system, providing a consistent directory tree hierarchy to the rest of the operating system.

虚拟文件系统建立了不同的基础物理文件系统到逻辑文件系统之间的桥梁，为操作系统中的其他部分提供了一致的目录树层次结构。

As mentioned earlier, the Cygwin installation directory ACTS as the root directory of your virtual UNIX system.

正如前面提到的，Cygwin安装目录作为虚拟unix系统的根目录。

This system model include the WEB server, application server and directory server. System provide virtual classroom, and permit client to set up the virtual classroom by himself.

在该模型中，包含有WEB服务器、应用服务器和目录服务器，系统提供了一个虚拟教室的功能，客户能够自建虚拟教室。