Charles Darwin once said that contemplating a peacock's tail made him sick, such was the difficulty of explaining its complexity.

查尔斯? 达尔文曾说过研究孔雀尾让他有头晕的感觉，可见想解释清楚其复杂性有多难了。

The wind had blown the fog away, and the sky was like a monstrous peacock's tail, starred with myriads of golden eyes.

风吹散了雾气，天空就像一只巨大的孔雀尾巴，点缀着无数金色的眼睛。

And so he was; for his body was white, and his tail orange, and his eyes all the colours of a peacock's tail.

他就是这样； 因为他的身体是白色的， 他的尾巴是橙色的， 他的眼睛是孔雀尾巴的所有颜色。

The sail and tail may not have been for  balance and propulsion respectively, but rather, a display for sexual selection, like a  peacock's tail.

帆和尾巴可能不是分别用于平衡和推进，而是用于性选择的展示，就像孔雀的尾巴一样。