When an object, an image, or a draw object is selected, you will see the borders of the object in the ruler. You can change the borders by dragging them on the ruler with the mouse.
当选择了对象、图像或绘图对象时，标尺上将显示该对象的边框。您可以使用鼠标在标尺上拖动边框以修改边框。