Like other profiles built on top of the serial port profile, the virtual serial link created by the lower layers of the Bluetooth protocol stack is transparent to applications using the DUN profile.
和其他建立在串口配置文件之上的配置文件一样，被更低层蓝牙通信协议实现的虚拟串行链接对使用DUN配置文件的应用程序是透明的。
Like other profiles built on top of the serial port profile, the virtual serial link created by the lower layers of the Bluetooth protocol stack is transparent to applications using the DUN profile.
和其他建立在串口配置文件之上的配置文件一样，被更低层蓝牙通信协议实现的虚拟串行链接对使用DUN配置文件的应用程序是透明的。
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