stagnation steam parameter

例句：

1. 1. The engine's performance has been stagnation for the past few months.
   这台发动机的性能在过去几个月里一直停滞不前。
2. 2. The road was stagnation due to heavy rain.
   由于大雨，道路变得停滞不前。
3. 3. The project has been stagnation since the beginning of the year.
   自年初以来，该项目一直处于停滞状态。