Original sentence: According to frame material, there are three types of wheelchairs,they are steel wheelchair,aluminum wheelchair and plastic wheelchairs.Among steel wheelchairs,there are stainless steel wheelchairs and normal steelchairs.China Fosun Medical System is professional new manufacturer and supplier for steel and aluminum wheelchairs, every year, Fosun supply the world market with nearly one million pcs of wheelchairs.Now the most popular wheelchairs use steel and aluminum as main material