upper intake passage

例句：

1. 1. The upper intake passage is where the water enters the system from the top.
   上进的通道是水从顶部进入系统的通道。
2. 2. The upper intake passage is crucial for maintaining proper water flow in the system.
   上进的通道对于保持系统内水流畅通至关重要。
3. 3. The upper intake passage was designed to prevent sediment buildup and improve efficiency.
   上进的通道被设计来防止沉积物积累并提高效率。