This semester, we taught a new mathematics knowledge-translation and rotation. In fact, my understanding of these two concepts is very simple. Translation means that a figure moves to another position along a straight line without changing its shape and size. Rotation refers to rotating according to a central point, while the size and shape of the figure remain unchanged.

In life, there are many objects moving and rotating around us. First, like my mother's car driving from home to the company, my understanding is that the car has translation; The chair at home moved from the living room to my small room, which I also understand as the translation of the chair.

There's a lot of rotation. Walking in the street, I saw the windmill in the hands of children, which was spinning vigorously. My understanding is that the blades of the windmill are spinning. When the car starts, the iron support frame in the middle of the car tire is also rotating. At the door of the barber shop, the black and white advertising light box is spinning, and my understanding is also spinning. When our electric fan is turned on, there are three blades turning.