1. Integrodifferential equations are equations involving both derivatives and integrals of unknown functions.

积分微分方程是涉及未知函数的导数和积分的方程。

2. The study of integrodifferential equations plays a crucial role in various fields of mathematics and physics.

积分微分方程的研究在数学和物理学的各个领域中起着重要作用。