upflow anaerobic sludge blanket

例句：

1. 1. The upflow of water from the river is causingflooding in the city.
   河流的上升水流正在导致城市洪水。
2. 2. Upflow is acommon phenomenon in many rivers and streams.
   在许多河流和溪流中，上升流是一种常见的现象。
3. 3. The upflow of nutrients into the ocean is amajor source of pollution.
   营养物质进入海洋的上升流是主要的污染源。