一、line of symmetry意思：
对称线；
封称线
例句
A kite is a quadrilateral with one line of symmetry. 风筝是个有一条对称线的四边形。
Smooth curved arch of the main line, symmetry and light Fuzhao foursmall arch, as if the four giant Yuhuan, decorated in the fall of the deck.
弧形平坦的主拱线上，对称地轻伏着四个小拱，仿佛四个巨型玉环，装饰在桥身两肩。
二、短语
a figure of line symmetry 轴对称图形
