mechanism of fracture

例句：

1. 1. The mechanism of the machine is very simple.
   这台机器的机制非常简单。
2. 2. The mechanism of the brain is still not fully understood.
   大脑的工作机制仍然不完全理解。
3. 3. The new design has a better mechanism for energy efficiency.
   新设计有更好的能源效率机制。