reciprocal quantity

例句：

1. 1. The two companies have agreed to a reciprocal exchange of technology.
   两家公司同意技术互换。
2. 2. The teacher and the student are both reciprocal quantities in this equation.
   这个方程中老师和学生都是互为变量。
3. 3. In economics, the concept of reciprocity is often used to describe the behavior of individuals who exchange goods or servicesin return for something else.
   在经济学中，互惠的概念通常用来描述个体交换商品或服务以换取其他东西的行为。