当尾巴摆动时，水会移动并拖动颗粒。
As the tail swings, the water moves and drags the particles along.
而它的尾巴摆动起来就像一台大功率的推进器。
这种转变包括从用前肢划水到身体波动再到尾巴摆动，就像现代鲸鱼的水平尾鳍。
This transition to living in the sea involved changes from paddling with limbs to undulating the body to oscillating a tail, such as the horizontal tail flukes in modern whale species.
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