closed loop policy

例句：

1. 1. The company implemented a closed-loop policy to reduce waste and increase efficiency.
   该公司实施了闭环政策，以减少浪费并提高效率。
2. 2. In the closed-loop system, the waste is recycled and reused.
   在闭环系统中，废物被回收和再利用。
3. 3.The closed-loop policy has been successful in reducing emissions and promoting sustainability.
   闭环政策已在减少排放和促进可持续性方面取得了成功。