Windows Meeting Space uses Windows Vista's support for Teredo tunneling to allow IPv4 connections over the Internet. 使用者可以加入一个别人建立的会议,或者是自己建立一个会议并邀请别人加入。
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,新隧道的掘进不可避免地对既有隧道产生影响。