建筑物本身的外围墙体exterior wall

• 院子的外墙除大门外，没有窗户或通道与胡同相连。

  Apart from the main door, the exterior wall of the courtyard has no windows or thoroughfares to the alley.

• 外墙的泥土已脱落，院内还是纸糊的窗户。

  The clay on the exterior wall is already falling off, and inside there are still papered windows.