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.
草长在绵延的岩土间细窄的石缝里。
Grass can be found only in narrow strips separated by long stretches of rock and dust.
一副细窄的眼镜挂在鼻梁上，看上去像是一位中年教授。
A pair of thin spectacles rested upon the bridge of his nose, giving him the look of a middle-aged professor.
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