有在美国学高中pre-calculus微积分的吗

symmetric about the y-axis.

(横)缩小两倍是 horizontal compression by a factor of 2 比较专业
(竖)缩小两倍：vertical compression by a factor of 2
(横)拉长两倍：horizontal stretch by a factor of 2
(竖)拉长两倍：vertical stretch by a factor of 2

想表达某图像关于Y轴对称的英语怎么说?
The image/graph/figure... is symmetrical about y-axis

图像变换(Geometrical transformation)的专业说法有：

1、反射（Reflection）:
例一：Find the equation of the line y = x - 3 under a reflection in the x-axis

例二：Under a reflection, the point A(3,4) is mapped onto (6,8)...

2、旋转(Rotation):
例一：The figure shows the construction of the centre of rotation...
例二：The point of intersection of m1 and m2, R is known as the centre of rotation.

3、平移(Translation):
例一：T is the translation (2,3) and ....
例二：A translation T maps the point (4,5) onto the point (-3,-4)...

4、放大(Enlargement):
例一：An enlargement maps triangle ABC onto triangle DEF...
例二：The ima