regeneration of vegetation

例句：

1. 1. The forests are undergoing a process of regeneration as the old trees are replaced by new ones.
   森林正在经历一个过程，旧树被新树取代。
2. 2. The government has initiated a program to promote the regeneration of degraded land.
   政府已经启动了一个项目来促进退化土地的再生。
3. 3. The regeneration of the ecosystem is crucial for maintaining biodiversity and preventing environmental degradation.
   生态系统的再生对于维持生物多样性和防止环境退化至关重要。