Signhasbecomeascientifichotbutton.Onlyinthepast20yearsh...
问题详情：Signhasbecomeascientifichotbutton.Onlyinthepast20yearshavespecialistsinlanguagestudyrealizedthatsignedlanguagesareunique----aspeechofthehand.Theyofferanewwaytoprobehowthebraingeneratesandunder...