所有有效广告的秘密不在于创造新的和巧妙的文字和图片，而在于将熟悉的文字和图片置于新的关系中。
The secret of all effective advertising is not the creation of new and tricky words and pictures, but one of putting familiar words and pictures into new relationships.
系统辨识的挑战不仅在于拟合数据，还在于提取有意义且可推广的模型。