secondary vegetation

例句：

1. 1. The forestwas once a primary habitat for many speciesof birds and animals.
   这片森林曾是许多鸟类和动物的主要栖息地。
2. 2. The reforestation efforts have helped to restore secondary vegetationin the area.
   重新造林工作帮助恢复了该地区的次生植被。
3. 3. The secondaryvegetation is starting to takeover the landscape.
   次生植被开始接管了整个景观。