如果一个平面图形沿着一条直线折叠后,直线两旁的部分能够互相重合,那么这个图形叫做轴对称图形（a figure has reflectional symmetry）,这条直线叫做对称轴（axis of symmetry）。
注：斜放的图形只要能沿一条直线折叠,直线两侧的图形能够互相重合,就是轴对称图形。在轴对称图形中间画一条线,那条线叫对称轴。
3、Standing at the center of the majestic cathedral, I marveled at the symmetrical grandeur of the towering pillars, as if the weight of the world on each side was perfectly balanced in an axis of symmetry.
4、His artwork was an exquisite display of creativity, with intricate patterns and vibrant colors flowing effortlessly along the canvas, creating a harmonious dance of forms, all perfectly aligned with the concept of symmetry.
5、AsI watched the graceful swans glide across the tranquil lake, their mirrored images reflecting in the still water, I couldn't help but be captivated by the beauty of nature's perfect symmetry.
