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並前往https://www.nytimes.com/2019/05/04/smarter-living/500-days-of-duolingo-what-you-can-and-cant-learn-from-a-language-app.html

500 Days of Duolingo: What You Can (and Can't) Learn From

Free language learning apps often promise the world — but don't expect fluency from one. Here's what to expect before you sign up.

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