他整天钻研数学难题。 他整天鑽研數學難題。 他整天鑽研數學難題。
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- Simplified
- 他整天钻研数学难题。
- Traditional (Taiwan)
- 他整天鑽研數學難題。
- Pinyin
- Bopomofo
Written with HSK 7-9 vocabulary, at CEFR level C1.
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