關於「Duolingo app」標籤，搜尋引擎有相關的訊息討論：

Duolingo - The world's best way to learn a languagewww.duolingo.comDuolingo - Xx.com › duolingoDuolingo - Language Lessons on the App Store - Appleapps.apple.com › app › duolingo-language-lessonsThe world's best way to learn Chinese - Duolingowww.duolingo.com › CoursesDuolingo: