I saw the Mona Lisa's mysterious smile, the indelible smile.

我看到了画中蒙娜丽莎那神秘的微笑，那不可磨灭的微笑。

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One of his assignments was a portrait of a woman with a mysterious smile.

他的作品之一就是一位拥有神秘笑容的女子的画像。

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Then I remembered Professor Ruan's mysterious smile when he said, "When you play it, you will know. ""

我突然想起了阮老师说“当你第一次拉响它的时候，你就会明白了”时，那捉摸不透的微笑。

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