For example, a Smartphone intended to communicate up and walk up the stairs instead of the elevator so they are not tired and time-saving artificial life support robot, etc.
For example The smart phones are communicating. The walk up the stairs instead of the elevator is not tired, and save time. The robot rescue and so on.
For example, a smart phone for communication. Forming the elevator instead of walking up the stairs not tired and save time. The invention of the robot rescue, etc.