Image: As it moves, a shark's tail (shown) creates two connected rings of moving water (blue and red represent opposing flows) that help make this fish such a powerful swimmer. (Brooke E. Flammang).
图：当鲨鱼移动时，尾巴会产生两个连接在一起的流动的水圈(蓝色和红色代表相反的水流)，这使得鲨鱼有着强大的游动能力。
Image: As it moves, a shark's tail (shown) creates two connected rings of moving water (blue and red represent opposing flows) that help make this fish such a powerful swimmer. (Brooke E. Flammang).
图：当鲨鱼移动时，尾巴会产生两个连接在一起的流动的水圈(蓝色和红色代表相反的水流)，这使得鲨鱼有着强大的游动能力。
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