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小鱼是怎么在水里游的
更新时间: 2020-09-22 00:00:00  

鱼是靠鱼鳍、鱼尾的摆动产生前进的动力。

鳍的作用是游动及平衡的器官。胸鳍和腹鳍能防止头尾上下停动,稳定鱼体。如改变胸鳍与水平线的角度,则能藉以浮沉。鱼的尾鳍是最主要的推进器官,使其沉稳地向前移动。

排列在鱼脊柱两侧有对称的肌肉,一侧肌肉收缩,另一侧肌肉伸展,因此鱼体才得以顺利摆动,产生前进的动力。

关键词: 怎么

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