differential variable

例句：

1. 1. In economics, the concept of a differential variable is used to measure the rate of change in a variable over time.
   在经济学中，差分变量的概念被用来测量一个变量随时间的变化率。
2. 2.The researcher found that the differential variable explained a significant portion of the variance in the data.
   研究者发现，这个差分变量解释了数据变异的很大一部分。
3. 3. To predict future trends, the team used a differential variable that accounted for seasonal variations in demand.
   为了预测未来的发展趋势，团队使用了一项差分变量，该变量考虑了需求的季节性变化。