duolingo inc tải duolingo Duolingo, Inc., b is an American educational technology company that produces learning apps and provides language certification. Duolingo offers courses on 43 languages, 5 ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo, and even constructed languages such as Klingon. 6
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duolingo abc Duolingo ABC is an app that teaches preschool to second grade kids phonics, sight words, vocabulary and more through interactive stories and lessons. It is designed by literacy and early-education experts and offers fun mini games and rewards to keep kids motivated and confident
