...在世界范围内，大概有 3 亿法定盲人（legally blind），这些人几乎失去了获取视觉信息的重要功能。目前虽有部分旨在帮助这类人群重新获取感知世界能力的产品，但一般是利用外设摄像头...
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所有的参赛队员除了守门员都是法定盲人，球里放有鹅卵石，那么队员可以知道球的位置。
All of the players are legally blind, except for the goal keeper, and the soccer ball has pebbles in it so the players can tell where it is.
研究人员拿两组盲人偏头痛者作对比，一组完全失明，另一组法定失明，但还分辨得出光和暗。
One group was totally blind. The other group was legally blind but could still make out light and dark.
研究人员拿两组盲人偏头痛者作对比，一组完全失明，另一组法定失明，但还分辨得出光和暗。
So researchers took two groups of blind migraine sufferers. One group was totally blind. The other group was legally blind but could still make out light and dark.
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