Appendages of fish or other aquatic animals used for movement and steering.

鱼类或其他水生动物用于推进和转向的鳍。

Footwear with blade-like extensions worn by swimmers or divers to increase thrust.

游泳者或潜水员穿戴的脚蹼，用于增强推进力。

Stabilizing or steering projections on aircraft, rockets, missiles, or surfboards.

用于稳定或转向的翼片，见于飞机、火箭、冲浪板等。

Thin protruding surfaces on radiators, engines, or heatsinks that dissipate heat.

用于散热的薄片状肋片，见于散热器、发动机或散热片。