等光程的

例句：

1. 1.The physicist calculated the lightpath of the laser beam.
   物理学家计算了激光束的光程。
2. 2. The measurement of lightpath is crucial for the experiment.
   测量光程对于实验至关重要。
3. 3. The scientist used aspecial device to measure the light path.
   科学家使用了一种特殊设备来测量光程。