Each slide has only one pivot point. Double-click an object to move the pivot point to the centre of the object. You can also drag the pivot point to a new location on the screen, and then rotate the object.
每个幻灯片只有一个旋转点。双击对象，使旋转点移到对象的中心。您也可以将旋转点拖动到屏幕中的新位置，然后再旋转对象。