Tatoeba Examples
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- Runtime tables: `smart_examples`, `smart_example_tokens`,
  `smart_word_examples`, `smart_example_translations`, `smart_example_patterns`
- Source: https://tatoeba.org and https://downloads.tatoeba.org/exports/
- License: CC BY 2.0 FR, with part of the corpus also available under CC0
- Current runtime source marker: `source=tatoeba`

The app imports Chinese-English and Chinese-French sentence pairs for learner
examples, example search, token highlighting, and example-based study tasks.
English and French variants share the same Chinese sentence and tokenization.
The runtime database keeps the original English-pair provenance in
`smart_examples` and stores every retained French translation's Tatoeba
sentence ID, source links, contributor attribution, and license in
`smart_example_translations`. French examples fall back to English when a
French translation is unavailable.