free-free transition

例句：

1. 1. The free-free transition from one system to another is a crucial step in the process of change.
   从一个系统到另一个系统的自由过渡是变革过程的关键步骤。
2. 2. During the free-free transition, the economy will experience significant changes in its structure and function.
   在自由过渡期间，经济将经历其结构和功能的显著变化。
3. 3. The free-free transition has brought about a new era of innovation and progress.
   自由过渡带来了创新和进步的新时代。