在运行roslaunch时出现了类似下面的错误：
RLException: [mav_hovering_example.launch] is neither a launch file in package [rotors_gazebo] nor is [rotors_gazebo] a launch file name
The traceback for the exception was written to the log file
这是因为setup.bash文件没有进一步说明包的来源，解决方法是：
source catkin_ws/devel/setup.bash
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