It may be concluded that principal reactions between the hydrazine fuels and clay are physical absorption and chemical degradation.

肼类燃料在土壤环境中与粘土的作用最强，主要存在着物理吸附与化学降解两个方面。

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Globally, soil erosion, chemical deterioration and physical degradation are the important forms amongst various types of soil degradation.

土壤侵蚀、化学退化、物理退化是全球范围内最主要的退化形式。

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In this paper, the advances in research of chemical degradation, physical degradation and biodegradation were discussed.

本文介绍并评述了化学降解、物理降解和生物降解等壳聚糖降解方法的研究进展。

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