urban rail-transit的用法和样例：
例句
- Traction calculation of trains is one the important composing of the whole urban rail traffic.
列车牵引计算是整个城市轨道交通的重要组成部分。 - Based on the study and experiences gained from urban metro and rail transit AFC systems, some basic design ideas of the future Maglev AFC system are described in this paper.
基于目前上海磁浮交通系统，结合城市轨道交通自动售检票系统和铁路售票系统的经验，提出磁浮交通售检票系统设计的一些基本思想和实施方案。
