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a screen or wall decoration at the back of an altar, in the form of a hanging, tapestry, painting, or piece of metalwork or sculpture 祭坛背后装饰的屏风、挂毯、绘画或金属雕像
But it was in 1311 that Duccio achievedhisprincipalwork, thegloryof which isdestined toremaintraditional, the great reredosforthe high altarof the Siena cathedral.