アンデス文明で話されていた共通語は何？
The main form of communication and record-keeping in the empire were quipus, ceramics, textiles and various dialects of Quechua, the language the Incas imposed upon the peoples within the empire. While Quechua had been spoken in the Andean region, including central Peru, for several centuries prior to the expansion of the Inca civilization, the dialect of Quechua the Incas imposed was an adaptation from the Kingdom of Cusco (an early form of "Southern Quechua" originally named Qhapaq Runasimi, or 'the great language of the people'), or what some historians define as the Cusco dialect.
Quechua