请将以下句子翻译成英语：这幅画被称为《北方的蒙娜丽莎》(Mona Lisa)，确切地说，是因为它画了一位面带神秘微笑的女人，那微笑蕴藏着多层意义和疑问。

请将以下句子翻译成英语：这幅画被称为《北方的蒙娜丽莎》(Mona Lisa)，确切地说，是因为它画了一位面带神秘微笑的女人，那微笑蕴藏着多层意义和疑问。
正确答案：It has been described as the Mona Lisa of the north, precisely because it appears to be a simple likeness of a woman with an enigmatic smile, yet which contains levels of meanings and questions.