庐山真面目（廬山真面目）　

◎ 庐山真面目 lúshān zhēn miàn mù

[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