- 问题详情:Signhasbecomeascientifichotbutton.Onlyinthepast20yearshavespecialistsinlanguagestudyrealizedthatsignedlanguagesareunique----aspeechofthehand.Theyofferanewwaytoprobehowthebraingeneratesandunderstandslanguage,andthrownewlightonanoldscientificco...
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