Stateful transforms are simple objects with member functions that maintain state across calls:
Source: Computational Materials Science, Volume 266
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"The area they were targeting was 500 acres of prime farmland, meadows, and orchards", explained Cllr Merrett.
小时候买衣服鞋子的地方，门口写着“年久失修，请勿靠近”（图：南方人物周刊记者 刘璐明）