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Sentence level translations, rather than word or paragraph level, graded by difficulty as beginner/intermediate/advanced. You can look up more about that resea

• mstipetic 10y ago
  Ah, ok, now I understand. The problem might be that we aren't using machine translated texts, but human translated. So when matching translations, often sentences don't have a 1-to-1 matching. Translators often change sentence structure to better suite the new language (there are even instances of translators adding new characters in the book). In any case, it's a very interesting problem