derivative controller

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 used to describe words that have more than one meaning.
   派生词用来描述有多重含义的词。
3. 3. The derivative market is a small but growing sector in the financial industry.
   衍生品市场是金融行业中一个小型但增长迅速的领域。