微分的

例句：

1. 1. The new drug is a derivative of the old one.
   这种新药是旧药的衍生物。
2. 2.Derivatives are often used to describe products that are made from other materials.
   衍生物通常用来描述由其他材料制成的产品。
3. 3. In chemistry, a derivative is a substance that is formed by adding another substance to a compound.
   在化学中，衍生物是通过向化合物添加另一种物质而形成的。