庐山真面目lú shān zhēn miàn mù

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。

英what Lushan Mountain really looks——the truth about a person or a matter; one's true character as the real face of Lushan Mountain;