应用: 百度地图
任务: 打开百度地图，进入打车，输入起点‘西安北站’，终点‘钟楼’
操作步骤:
step_id: 0
action: CLICK
step_id: 1
action: CLICK
step_id: 2
action: CLICK
step_id: 3
action: CLICK