long light path 长光程
Raytracers render phenomenally realistic images by following the path from the camera to a light source -- and they need a phenomenally long time to do so.
Raytracer 通过追踪从摄像机到光源的路径而清晰真实地展示了图像，但需要很长时间。
An external circuit provides a path for the electrons to return to the p-type material, producing an electric current along the way that continues as long as light strikes the solar cell.
此时接上一条外线电路，电子便通过线路流动到p层。只要光束持续地撞击太阳能电池，就会有持续的电流。
No light path can walk, as long as the heart is still there.
没有灯的小路一样可以行走，只要心还在。
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