The physicists give a simplified example of how this can happen: trying to reach a destination either by using a short but narrow bridge or a longer butwide motorway.

• 这些物理学家给出了此事发生的简单例证：试着从既定的两条路线到达目的地，其一为一座短而窄的桥，而另一则是长而宽的高速路。