The key was bending the light the optimal amount, enough that it enters the solar panel at an angle, but not so much of an angle that the light reflects off and is lost.
2
但是，眼睛必须去识别周围景象反射的细微光线，所以若要用光线来探路就需要远远比这多的能量了。
However, using light to find one’s own way around requires vastly more energy, since the eyes have to detect the tiny fraction of the light that bounces off each part of the scene.
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