Rotation phenomena:
Like rotating flying chairs, merry-go-rounds, rotation of fan blades, operation of electric motors, wind power generation, movement of clocks, rotation of Ferris wheels, rotation of drivers Steering wheels, turning nuts by hand, wheel working, boomerang spinning, etc. are all rotational phenomena.
Some objects rotate spontaneously, such as the earth itself, which rotates around its axis and revolves around the sun (elliptical orbit); some objects are driven by external forces to rotate, such as air conditioner cooling fans.
Translation and rotation are phenomena that students often see in their daily lives. In a mathematical sense, translation and rotation are two basic graphic transformations.
When I saw this news, my first reaction was that the van driver must have been distracted, because this kind of vehicle that pulls the electric blades is a special vehicle, and there are usually obvious signs everywhere. If the van driver hadn't been distracted and found out in time and prevented it in advance, there would definitely not have been such a tragedy