True, if one has a hammer, all problems look like nails. The real trouble begins when one thinks that the hammer might be the right solution for headaches, too.
的确，如果你有一把锤子，所有问题看起来都像是钉子。但如果你认为锤子可能是治愈头疼的有效方法，那么就会引来真正的麻烦。