Stateful transforms are simple objects with member functions that maintain state across calls:
The owner of Drax power plant has started reducing the amount of Canadian wood pellets it burns, and will stop burning trees from British Columbia entirely within the next year.
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精准帮扶，最终的落脚点在人。习近平总书记叮嘱：“脱贫致富终究要靠贫困群众用自己的辛勤劳动来实现。”
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