When you select an object, its dimensions are displayed on the rulers as grey double lines. To precisely resize the object, drag one of the double lines to a new location on the ruler.
当选择某个对象时，标尺上会显示灰色的双线条来指示该对象的尺寸。要精确修改选定对象的大小，请在标尺上将其中的一个双线条拖动到一个新的位置。