Connection protocol: This protocol multiplexes the encrypted tunnel to numerous logical channels, running over the User Authentication protocol.

连接协议：该协议多路传输加密隧道到多个逻辑通道，通过用户认证协议运行。

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Because the secure connection must "tunnel" through the proxy server to the intended destination, malicious proxy servers can very easily eavesdrop on any conversation.

因为安全连接必须由代理服务器提供一个隧道才能到达目的地，因此恶意的代理服务器就可以很容易地窃取任何会话。

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Network connection; for performance reasons, it doesn't use an IPSec tunnel.

网络通信；出于性能原因，它没有使用ipsec隧道。

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The first phase of HS2 will include a connection to mainland Europe via the Channel Tunnel.

BBC: HS2 compensation to be 'comprehensive'

Customers on Heathrow Express can use a Wi-Fi HotSpot service with a broadband connection of 2 Mbps throughout their entire journey -- even through a six-kilometer tunnel, helping travelers check their emails, view flight information or keep up-to-date with the latest news.

WSJ: Cutting Down On the To and Fro