A "Tower of Babel" device that gives the illusion of being bilingual is being developed by US scientists.
Users simply have to silently mouth a word in their own language for it to be translated and read out in another.
The researchers said the effect was like watching a television programme that had been dubbed.
The system, detailed in New Scientist, is not yet fully accurate, but experts said it showed the technology was "within reach".
The team currently has two prototypes: one that can translate Chinese into English and another that can translate English into Spanish or German.
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