ecological density

例句：

1. 1. The study of ecological density is crucial for understanding the impact of human activities on the environment.
   研究生态密度对于理解人类活动对环境的影响至关重要。
2. 2. The city has implemented measures to reduce its ecological density and promote sustainable development.
   该市已采取措施减少其生态密度，促进可持续发展。
3. 3. The ecological density of the forest is a key indicator of its health and resilience.
   森林的生态密度是衡量其健康状况和恢复力的关键指标。