触觉指示器
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tactile ground surface indicator 盲道
The evaluation indicator for tactile satisfaction is put forward and discussed on the basis of experiment.
在实验的基础上，提出并讨论了关于几何图形再现的触觉满意度评估指标。
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And, in any case, a tactile indicator helps deaf-blind people too.
BBC: The secret button at pedestrian crossings
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