ray ratio

例句：

1. 1. The camera's ray ratio is measured in meters per second.
   相机的射线比率以每秒米为单位测量。
2. 2.The scientist used a special ray ratio to study the effects of light on living organisms.
   科学家使用一种特殊的射线比率来研究光对活体生物的影响。
3. 3.The ray ratio was used to calculate the distance between two points on the Earth's surface.
   射线比率被用来计算地球表面两点之间的距离。