抱怨人性昨天和今天，明天期待不同的结果，是撞不超过一个人的反对人性的隐喻喻头墙明智的。

Complaining about human nature yesterday and today, and expecting a different outcome tomorrow, is no more wise than banging one's figurative head against the metaphorical wall of human nature.

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电缆头从墙里露出来了。

The end of the cable was left poking out of the wall.

《牛津词典》

经过8年多的认真研究之后，软件行业和它的客户正头撞南墙。

After 8 + years of intense research, the software industry and its customers are hitting a wall.

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