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.

youdao

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.

youdao