steady-state residence time

例句：

1. 1. The steady-state residence time of the reactor is 5 hours.
   反应器的稳态停留时间为5小时。
2. 2.The steady-state residence time of the gas in the tank is 10 minutes.
   储罐中气体的稳态停留时间为10分钟。
3. 3. The steady-state residence time of the pollutant in the environment is 7 days.
   环境中污染物的稳态停留时间为7天。