火车突然冲进黑暗的隧道或突然冲出光明，都会对视力造成极大的损害。
The sudden plunging of a train into the darkness of a tunnel, and the equally sudden rush into full daylight, would cause great damage to eyesight.
所以当血液流动不到眼睛时，视力就会衰退，黑暗就会从神经末梢蔓延到中心。
So when blood flow does not reach the eye, vision fails, and darkness ensues from the periphery to the center.
因为他“上帝创世般的勇气”，海伦凯勒写到，布莱叶为那些有视力缺陷的人群铺建了一条坚实的道路，让他们开始从绝望的黑暗中攀登到思想的绝顶。
With his “godlike courage, ” Helen Keller wrote, Braille built a “firm stairway for millions of sense-crippled human beings to climb from hopeless darkness to the Mind Eternal.”
在黑暗中生活的动物可能会在进化过程中失去视力，甚至可能一点东西都看不见。
Creatures that live in the dark may lose their sight over evolutionary time. They may even lose their eyes entirely.
黑暗会使他更加珍惜视力。
英国的两位女士只在夜晚或者是早上出现了神秘的视力问题，结果是由一个相当无伤大雅的原因引起的的——那就是在黑暗中看手机。
For two women in the United Kingdom, mysterious vision problems that happened only at night or early in the morning turned out to have a rather innocuous cause: looking at a smartphone in the dark.
黑暗会使他更珍惜视力，寂静会教导他享受声音。
Darkness would make him more appreciative of sight, silence would teach him the joys ofsound.
英国的两位女士只在夜晚或者是早上出现了神秘的视力问题，结果是由一个相当无伤大雅的原因引起的——那就是在黑暗中看手机。
For two women in the United Kingdom, mysterious vision problems that happened only at night or early in the morning turned out to have a rather innocuous cause: looking at a smartphone in the dark.
黄昏降临时，人该感逢到双倍的高亡，由于能看到人制的光芒，那是人类的天才创制出来的，当大天然黑暗降临之时，以延展他的视力。
When dusk had fallen, I should experience the double delight of being able to see by artificial light which the genius of man has created to extend the power of his sight when Nature decrees darkness.
黑暗将使他更加珍惜视力，沉寂将使他领略声响的乐趣。
Darkness would make him more appreciative of sight, silence would teach him the joys of sound.
她是幸运的，因为马克给了她一份比视力还要强大的礼物，一份不需要用双眼看到才会相信的礼物——爱之礼物，这一礼物给她黑暗的世界带来无限光明。
She was lucky, so lucky, for he had given her a gift more powerful than sight, a gift she didn't need to see to believe—the gift of love that can bring light where there is darkness.
她是幸运的，因为马克给了她比视力更珍贵的礼物，一份她不需要看就能体会到的礼物——这就是爱的礼物，它能给黑暗带来光明。
she was so lucky for he had given her a gift more powerful than sight, a gift she didn't need to see to believe—the gift of love that can bring light where there is darkness.
只有百分之十八视力严重受损的人永久失明，大部分盲人能够区分光明和黑暗。
Only 18 percent of people who have visual impairments are totally blind. Most are able to differentiate between light and dark.
黑暗视觉：密语侏儒在黑暗中的视力范围是60英尺。
Darkvision: Whisper gnomes can see in the dark out to 60 feet.
凯伦·霍普金报道。生活在黑暗环境下的生物可能在演化过程中视力逐渐下降。
Creatures that live in the dark may lose their sight over evolutionary time.
一年前，Hudspeth丧失了全部视力，而他要面临的，是余生都生活在黑黑暗。
He lost his sight completely one year ago and expected to live the rest of his life in darkness.
视力好的蝙蝠甚至能在黑暗中看见静止不动的飞蛾呢！
Good eyesight bats also have good eyesight. Some kinds of bats can see very well in the dark.
视力好的蝙蝠甚至能在黑暗中看见静止不动的飞蛾呢！
Good eyesight bats also have good eyesight. Some kinds of bats can see very well in the dark.
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