在调查之前，已经完成了一个新的轻型城市轨道交通系统的建设，第二个在轨道的完成后12个月到18个月建设。
One survey was done before the city had finished building a new light rail system, and the second was done from 12 to 18 months after the rail's completion.
随着国内城市轨道交通工程的不断建设，其安全问题也变得日益重要。
With the increasing construction of urban railway traffic engineering in home, its safety is becoming morn and more important.
地铁隧道施工对邻近隧道和其他既有结构的影响问题是城市轨道交通建设中的常见问题。
It constitutes a common problem that urban tunneling exerts negative influences on nearby tunnels and existing structures.
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