People with leg disabilities need to use wheelchairs to walk. However, the wheelchairs currently in use are only suitable for flat surfaces. Therefore, when going out, disabled people usually need someone to accompany them and help push from behind on slightly uneven surfaces or uphill. It's even more troublesome to go up stairs or to the restroom. Therefore, the current wheelchair has many usage limitations. However, if there was such a universal wheelchair, disabled people wouldn't need an escort and could go out alone, visit many places, and do a lot of things. This universal wheelchair can undergo corresponding transformations: it functions as a regular wheelchair on flat surfaces, but transforms into a tracked vehicle when needed to climb stairs, allowing free movement up and down stairs without assistance. Its seat can be elevated, making it possible to reach items on shelves while shopping at the supermarket while seated. Of course, using such a wheelchair also makes it possible to independently use the restroom. If this kind of universal wheelchair could become widespread at some point, it would save disabled people a great deal of trouble and inconvenience.