Spherical reflectors don't perfectly focus all the incoming rays.

球面反射器不能完美地聚焦所有入射光线。

The beauty of a spherical reflector is that, by changing the position at which you measure the reflected waves above the dish, you're measuring those waves from different parts of the sky.

球形反射器的美妙之处在于，通过改变测量盘上方反射波的位置，您可以测量来自天空不同部分的这些波。