求翻译：　1．降低成本——通过公用网来建立VPN，就可以节省大量的通信费用，而不必投入大量的人力和物力去安装和维护WAN(广域网)设备和远程访问设备。是什么意思？

　1. Reduce costs--to establish a VPN across the public network, you can save a lot of communications costs without having to invest a lot of manpower and resources to install and maintain WAN (wide area network) device and the remote access device.

1) reduce costs - through public networks to establish VPN, you can save a lot of communication costs, and does not need to invest a lot of manpower and material resources to install and maintain WAN (wide area network) Equipment and remote access equipment.

　1. Reduce costs--to establish a VPN across the public network, you can save a lot of communications costs without having to invest a lot of manpower and resources to