n.[C]

1. 壁架；架状突出物
   a window ledge

   窗台

2. 岩架，岩石突出部
3. （近海岸的）暗礁
4. 矿脉

n.

1. a narrow horizontal surface projecting from a wall, cliff, etc.
2. an underwater ridge, especially one of rocks near the seashore.
3. Mining  a stratum of metal-bearing rock.