They are both considered tunneling protocols –because they create a "virtual tunnel" by applying much needed encryption.

他们都认为隧道协议，因为他们创建一个“虚拟隧道”运用急需的加密技术。

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A private network between two remote sites, over a secure encrypted virtual Internet connection (a tunnel).

两个远程站点间专用网络，通过安全加密的虚拟因特网连接通道。

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The paper describes the measurement method for model surface temperature and model surface illumination strength in wind tunnel optical pressure measurement test by the virtual instruments.

本文介绍了在风洞光学测压试验中应用虚拟仪器技术对模型表面温度和模型表面光照强度的测量方法。

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Pilots will navigate the virtual racetrack projected as a tunnel onto a heads-up display while viewers at home will see the rockets superimposed onto the virtual course just like that yellow first-down-line you see while watching American Football.

ENGADGET: Rocket Racing coming in 2007

And traffic between geographically separated company networks can be routed through a virtual private network (VPN) tunnel instead of being exposed to the open Internet.

CNN: Analysis: Linux security

As part of the virtual stroll, observers can experience a tour of the Colts' locker room premises, a tunnel that was once graced with Peyton Manning's presence and plenty of other areas around the stadium -- such as the Quarterback, Field Level and Loge-Level suites.

ENGADGET: Google Maps goes inside an NFL stadium for first time, takes fans on a virtual tour of the Colts' home