鱼鳍坚硬、光滑且细窄，这些特性也有助于减少阻力。
The fins are stiff, smooth, and narrow, qualities that also help cut drag.
人们认为这些沟槽有助于将水从嘴中输送到鳃裂外，从而减少水的阻力。
It is thought that these grooves help to channel water through the mouth and out the gill slits, thereby reducing water resistance.
这些优势有助于优化大翼外形并减少气动凸表，从而减小阻力并提高飞机的性能。
This also optimizes wing shape and reduces the potential need for bulging aerodynamic surfaces, which in turn reduces drag and increases airplane performance.
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