他研究理学已经二十年了。 他研究理學已經二十年了。 他研究理學已經二十年了。
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- Simplified
- 他研究理学已经二十年了。
- Traditional (Taiwan)
- 他研究理學已經二十年了。
- Pinyin
- Bopomofo
Written with HSK 4 vocabulary, at CEFR level B1.
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