Line of symmetry
01
对称线, 对称轴
a line that divides a shape into two congruent parts
例子
A circle has an infinite number of lines of symmetry because it can be divided into two equal halves along any diameter.
一个圆有无限数量的对称线，因为它可以沿着任何直径被分成两个相等的部分。
The letter ' A ' has one vertical line of symmetry that splits it into two identical halves.
字母'A'有一条垂直的对称线，将其分成两个相同的部分。
