说明：  这是数字网络硬盘录像机的用户指南。 该指南向您介绍数字网络硬盘录像机的各项功能的操作方法、维护及常见故障排除等。
(This is a digital network DVR user' s guide. The guide introduces you to the digital network DVR features methods of operation, maintenance and common troubleshooting.)