T-Z curve

例句：

1. 1.The T-Z curve is a mathematical concept that describes the relationship between two variables.
   T-Z曲线是描述两个变量之间关系的数学概念。
2. 2.In economics, the T-Z curve is used to analyze the impact of taxes on consumer behavior.
   在经济学中，T-Z曲线被用来分析税收对消费者行为的影响。
3. 3. The T-Z curve can be used to predict the optimal level of taxation for a given level of income.
   T-Z曲线可以用来预测给定收入水平下的最优税率。