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某公主爱上了牧羊人，国王发现后大发雷霆，他想出了一条“妙计”：在一间房里关了美女，一间房里放了老虎，要牧羊人去拉其中一间房门，拉到美女房间即娶美女，拉到老虎房间就被老虎吃掉。牧羊人在拉门前，回头看了一下公主，公主指了指右边的门，如门里是美女，公主将眼看爱人与他人成婚，如是老虎，公主将眼看爱人被老虎吃掉，由此产生了一道世界性难题：公主指的门里是美女还是老虎？
A princess fell in love with the shepherd, the king found furious, he came up with a “wonderful plan”: in a room off the beauty, a room put a tiger, to the shepherd to pull one of the door, Pull to the beautiful room that is beautiful, pull the tiger room was eaten by the tiger. The shepherd in front of the sliding door, looked back at the princess, the princess pointed to the right door, such as the door is a beautiful woman, the princess will see lover marry others, such as the tiger, the princess will see the lover was eaten by the tiger, resulting A global puzzle: the door the princess is the beauty or the tiger?