derivative apparatus

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 in chemistry to describe compounds that have been created by combining other substances.
   在化学中，衍生物通常用来描述通过结合其他物质而形成的化合物。
3. 3. The company's latest product is a derivative of its previous model.
   该公司最新的产品是其前款产品的衍生物。