ay 放射线
eg.X-ray
beam 电波
eg.a line of light,electric waves or particles 光线；（电波的）波束；（粒子的）束
ray和beam的区别ray和beam的意思都为光线的时候,它们的区别是什么?
ay 放射线
eg.X-ray
beam 电波
eg.a line of light,electric waves or particles 光线；（电波的）波束；（粒子的）束