secondary wall

例句：

1. 1. The engineer designed a secondary wall to separate the two rooms.
   工程师设计了一个次要墙来分隔两个房间。
2. 2.The construction of the new building involved the installation of several secondary walls.
   新建筑的建设涉及到安装几个次要墙。
3. 3. The secondary wall is made of brick and provides additional insulation for the building.
   次要墙是用砖砌成的，为建筑物提供了额外的隔热层。