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A four-axis drone is one type of micro-drone and also a smart robot. It was initially successfully built by aviation model enthusiasts, and later many automation companies recognized its versatility and actively developed it further. It uses four rotors as flight engines to navigate in the air. With its smaller size and lighter weight, it can be carried and used like an unmanned aerial vehicle, capable of carrying a certain amount of mission payload and having autonomous navigation capabilities. It can carry out specific flight tasks in complex and dangerous environments.