sponson
/ˈspɒnsən/noun
1- a projection on the side of a boat, ship, or seaplane, in particular船侧（或水上飞机两侧的）凸出部, 舷台, 尤指：
1.1
- a gun platform standing out from a warship's side舰侧凸出炮座。
1.2
- a short subsidiary wing that serves to stabilize a seaplane水上飞机（用来保持平衡的）副翼。
1.3
- a buoyancy chamber fitted to a boat's hull, especially on a canoe（尤指小舟的）船缘气室。
1.4
- a triangular platform supporting the wheel on a paddle steamer明轮船上用于支撑明轮的三角形平台。
词源
mid 19th cent.: of unknown origin.