VOICE OVER: The team applied a mathematical tool based on a simple geometric principle: that certain triangular angles stay the same in different positions within a sphere.

画外音：该团队应用了一种基于简单几何原理的数学工具：某些三角形的角度在球体内的不同位置保持不变。

But a new study by mathematicians in Germany and the U.K. has applied the tools of chaos theory to show that divisions of a constructive kind could actually bring the pandemic under control much more effectively.

但德国和英国数学家的一项新研究应用混沌理论工具表明，建设性的分裂实际上可以更有效地控制大流行病。