steady-state level

例句：

1. 1.The concentration of pollutants in the air is a key indicator of the environment's steady-state level.
   空气中污染物的浓度是衡量环境稳态水平的关键指标。
2. 2.In order to maintain a stable population, it is essential to understand the steady-state level of resources.
   为了保持人口稳定，了解资源稳态水平至关重要。
3. 3.The steady-state level of carbon dioxide in the atmosphere has been steadily increasing due to human activities.
   由于人类活动，大气中二氧化碳的稳态水平一直在稳步上升。