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比喻事物的真相或人的本来面目。
[what Lushan Mountain really looks——the truth about a person or a matter; one's true character as the real face of Lushan Mountain] 宋·苏轼《题西林壁》诗:“横看成岭侧成峰,远近高低各不同。不识庐山真面目,只缘身在此山中。”后因以“庐山真面目”比喻一件事物的真相或一个人的本来面目