free-running fit

例句：

1. 1. The free-running system is designed to be energy efficient and environmentally friendly.
   这个自由运行的系统旨在高效节能，环保。
2. 2. The free-running system has been proven to be more reliable than traditional systems.
   自由运行系统已被证明比传统系统更可靠。
3. 3. The free-running system can be customized to meet the specific needs of different users.
   自由运行系统可以根据不同用户的具体需求进行定制。