美国科学60秒 SSS 2015-05-26

Foldable white canes help the visually impaired navigate their surroundings, but the guide stick's tactile (preceptible by touch or apparently so) nature offers only so much information. The cane's user must manually find and avoid obstructions, but

发表于:2018-12-24 / 阅读(49) / 评论(0) 分类 2015年Scientific American(五)月
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