orbit traffic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。 - This paper analyzes the network development of Shanghai UMT, discusses the systematic characters of Shanghai urban passenger traffic.
摘要论述了上海城市轨道交通的网络化发展，讨论了上海城市客运交通的系统特性。
