tunneling

1.Windows Meeting Space uses Windows Vista's support for Teredo tunneling to allow IPv4 connections over the Internet.

使用者可以个别建立，或者是自己建立个并邀请别。

2.Undercrossing tunnels are frequently constructed by the shield-driven method in metro projects.Shield tunneling affects the existing tunnel inevitably.

摘要在地铁工程中，常采用盾构法修建正交下穿隧道，新隧道掘进不可避免地对既有隧道产生影响。