Introduction to Lanzhou Waterwheel: The Lanzhou Waterwheel is about 16 meters in diameter. It consists of 16 pairs of spokes radiating from the axle to the rim to form a giant wheel. There are wipers at the top of the spokes, and 40 rectangular water cylinders are placed between the wipers. The wooden trough set up in the air can divert water. After four hundred years of production, it has become increasingly perfect. It has a unique structure, exquisite craftsmanship, majestic roughness and unique style. By 1952, there were 252 waterwheels standing on both sides of the Yellow River. , so spectacular that Lanzhou is also known as the "City of Waterwheels" and is well-known at home and abroad.