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.

然而，利用光来找到自己的方向极大地需要更多的能量，因为眼睛必须检测从场景的每个部分反射的光的极小部分。

The third grade, our class to a young teacher, her eyes one's eyes brimming with radiating vigour, face is very serious, but hidden inside the gentle light, give a person a sense of trust.

三年级时，我们班来了位年轻的班主任，她的眼睛炯炯有神，脸虽然十分严肃，但里面藏着温柔的光芒，给人一种很信赖的感觉。