回音壁是皇穹宇的围墙。
皇穹宇位于最中心。
现在咱们继续沿着中轴线行走，面前的建筑叫做天库，而它的正殿就是皇穹宇。
Now let's continue to walk along the axis, the building called days before the library, and it is the main hall emperor vault and planet.
皇穹宇是一个建在一层大理石底座上的单顶圆形建筑。平时，祭祀用品就存放在这个地方。
The Hall of Heavenly Lord is a single-gabled circular building, built on a single level of marble stone base, where the altars were housed when not in use.
皇穹宇是一个建在一层大理石底座上的单顶圆形建筑。平时，祭祀用品就存放在这个地方。
The Hall of Heavenly Lord is a single-gabled circular building, built on a single level of marble stone base, where the altars were housed when not in use.
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