建立汽车、火车和飞机的时刻表,旅行模拟查询系统以时间为轴向前推移,建立日志文件，对旅客状态变化和键入等信息进行记录,某旅客在旅行途中可更改旅行计划，系统应做相应的操作,用图形绘制地图，并在地图上反映出旅客的旅行过程(Establish time table of car, train and plane, travel simulation query system moves forward with time as axis, establish log file, record information such as passenger status change and typing, a passenger can change travel plan during the journey, the system should do corresponding operation, draw map with graph, and reflect passenger's travel process on the map)