样品频率磁化率曲线作为一种气候环境变化的代用指标也可以说明研究区域气候环境的变化，反映了一种干冷向暖湿变化的过程。
The sample magnetic susceptibility curve as a climate and environment index can show the research area's change and reflect the process of dry and cold to warm and humid.
包含在给定区域的质量随时间的变化率。
The rate of change with respect to time of the mass contained within a given region.
通过引入耕地面积相对变化率计算分析了张掖绿洲各区县耕地资源变化的区域差异。
By calculating the relative change ratio of the cultivated land, the author analyzes the difference of the cultivated land changes in the different sections of Zhangye Oasis.
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