虚拟专用网vpn是依托ISP或NSP，构建在公共网络上的，虚拟、私人专用数据通信网络。

Virtual private network (VPN), based on ISP or NSP, is a virtual and private data communication network set up in the public network.

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用虚拟专用网和多级用户权限认证技术保证抽油井数据网络传输的安全性。

Besides, Virtual Private network (VPN) and authority authentication technique are used to ensure the safety of network transmission.

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用虚拟专用网和多级用户权限认证技术保证抽油井数据网络传输的安全性。

Besides, Virtual Private network (VPN) and authority authentication technique are used to ensure the safety of network transmission.

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