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In essence: touchscreen keyboards operate on the presumption of visual capability. You visually locate your desired key. You press it. You observe the result. The entire feedback cycle depends on vision, and when vision is excluded from this cycle, the keyboard remains present but ceases to function in the same manner.
。关于这个话题，viber提供了深入分析
Software excels with certain limitations
Ученые объяснили исчезновение плазменного облака на подлете к Земле14:58