mixed calculus

例句：

1. 1. The engineer used a mix of techniques to solve the problem.
   工程师采用了多种方法来解决这个问题。
2. 2. The mixed calculus approach is often more effective than pure mathematics.
   混合微分学方法通常比纯数学更有效。
3. 3.In mixed calculus, we can find solutions that are both simple and elegant.
   在混合微分学中，我们可以找到既简单又优雅的解决方案。