optical distance

例句：

1. 1. The camera's optical lens is responsible for focusing the image.
   相机的光学镜头负责聚焦图像。
2. 2. The scientist used an optical microscope to examine the sample.
   科学家使用光学显微镜来检查样本。
3. 3.The optical properties of a material can be measured using a spectroscope.
   材料光学性质可以通过分光计测量。