结果表明：体系的温度升高和降低时，凝胶可发生热可逆溶胶-凝胶相互转变；

The results showed that the systems underwent the sol-gel transition with the increase and decrease of the temperature.

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有机化学是研究有机化合物的结构、性质、合成、反应机理和碳化合物间相互转变规律的一门学科。

Organic chemistry is the study of carbon-containing compounds. It is included that the structure, properties, reaction mechanisms, synthesis and transformation of organic compounds.

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磁铁矿和赤铁矿之间的相互转变一直被认为是一个氧化还原反应的结果，反应的发生与一定的氧化剂或还原剂密切相关。

The transformation of magnetite and hematite in nature has generally been considered as a result of a REDOX reaction and linked to a specific oxidant or reductant.

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