three-body problem

例句：

1. 1.The three-body problem is a complex mathematical problem that has been studied for decades.
   三体问题是一个复杂的数学问题，已经研究了几十年。
2. 2.In the three-body problem, the orbits of the three bodies are intersecting.
   在三体问题中，三个天体的轨道是相交的。
3. 3.The three-body problem is a classic example of a differential equation with multiple solutions.
   三体问题是一个经典的微分方程，具有多个解。