uncontrolled ventilation

例句：

1. 1.The hospital's uncontrolled ventilation system is causing a lot of problems.
   医院的无控制通风系统造成了很多问题。
2. 2. The engineers were concerned about the uncontrolled ventilation in the building.
   工程师们对建筑中的无控制通风感到担忧。
3. 3.To ensure proper ventilation, we need to install an uncontrolled ventilation system.
   为了确保良好的通风，我们需要安装一个无控制通风系统。