demand function

例句：

1. 1. The demand for this product hasincreased significantly in recent years.
   近年来，这种产品的需求量显著增加。
2. 2. The demand function is usedto model the relationship between price and quantity.
   需求函数用于模拟价格和数量之间的关系。
3. 3. Thedemand function can be used to predict futuremarket trends.
   需求函数可以用来预测未来的市场趋势。