方法通过反复柱色谱分离和重结晶纯化，并利用核磁共振波谱技术进行结构鉴定。
Method the compounds were isolated by column chromatography and purified by recrystallization and the structures were identified by NMR spectral data and other methods.
这些病害的形成是风蚀、雨蚀和易溶盐反复的溶解结晶等综合作用的结果。
All these diseases mentioned above are caused by wind erosion, rainfall erosion and repeated eutectic salt dissolving.
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