Two blind subjects used clicks and their echoes to distinguish objects like a car, tree or flag pole.
两名盲人受试者通过敲击和听其回声来辨别诸如汽车、树或棋杆等物件。
How would a blind person access the information visually formatted in a table, for example, or an icon, a tree, or a scrolling list?
例如，盲人如何才能访问表中可视化格式的信息，或图标、树或者滚动列表呢？
He had fallen out of a tree-blind five years ago while bow hunting — stuck an arrow through his leg.
五年前，他在射猎时从藏身的树上掉下来了，被一支箭刺穿了腿。
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