Generally speaking, objects move in translation and rotation. You know, after translation and rotation, the shape of the object is unchanged. Translation is generally two opposite movements. 1, meaning of translation and rotation: (1) Translation: The phenomenon that an object (or figure) moves along a straight line is called translation. ⑵ Rotation: The phenomenon that an object (or figure) moves in an arc or circle around a point or an axis is called rotation. 2. Similarities and differences between translation and rotation: (1) Similarity: both translation and rotation mean that the position of an object (or figure) changes, while the shape and size of the object (or figure) remain unchanged. ⑵ Difference: Translation means that the object moves along a straight line without changing its own direction; Rotation means that an object rotates around a point or an axis, and its own direction changes.