downgrowth

例句：

1. 1. The plant growsdowngrowths on the branches.
   这种植物在树枝上生长着向下生长的叶子。
2. 2. The forest is experiencing a downgrowth in its biodiversity.
   森林正在经历生物多样性的下降。
3. 3. The city has experienced a downgrowth in population due to economic development.
   由于经济发展，这个城市的人口经历了下降。