occluder

例句：

1. 1. The occluder is blocking the path to the exit.
   这个障碍物挡住了通往出口的路。
2. 2. The occluder was designed to prevent accidents.
   这个障碍物被设计来防止事故。
3. 3.The occluder was removed by a skilled technician.
   这个障碍物被一位熟练的技术员移除了。