mechanics of rock cutting

例句：

1. 1. Mechanics are the people who design and build machines.
   机械师是设计和建造机器的人。
2. 2. The mechanics of a car engine are complex and require specialized knowledge.
   汽车发动机的工作原理复杂，需要专门的知识。
3. 3. The mechanics of modern technology have changed dramatically over the years.
   现代技术的力学原理多年来发生了巨大变化。