·2,447,543篇论文数据，部分数据来源于NoteExpress
Other scientists have looked at materials like leaf compost or manure, while Professor Brown favors composts high in iron content, like the sludge from wastewater treatment.
其他科学家们寄希望于树叶堆肥或粪肥一类的物质，而布朗教授更偏爱铁含量较高的堆肥，例如来自废水处理过程中的污泥。
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