near axial ray

例句：

1. 1. The near axial ray is the part of a beam that is closest to the axis of the source.
   近轴射线是一束光中距离光源最近的部分。
2. 2.In the study of light, near axial rays are used to measure the intensity of light at different distances from the source.
   在研究光的研究中，近轴射线被用来测量不同距离上光源的光强度。
3. 3. The near axial ray is crucial for understanding how light interacts with matter.
   近轴射线对于理解光与物质相互作用至关重要。