edge of Mach cone

例句：

1. 1. The edge of the Mach cone is where the flow speeds change dramatically.
   马赫锥的边缘是流速急剧变化的地方。
2. 2. The Mach cone is a key concept in fluid dynamics.
   马赫锥是流体动力学中的一个关键概念。
3. 3.The edge of the Mach cone is where the shock wave meets the flow.
   马赫锥的边缘是激波与流相遇的地方。