center line of wall

例句：

1. 1.The engineer drew the center line of the wall on the blueprint.
   工程师在蓝图上画了墙的中心线。
2. 2.The construction workers carefully marked the center line of the wall before starting work.
   施工工人在开工前仔细标出了墙的中心线。
3. 3.The architect designed the center line of the wall to be straight and level for aesthetic purposes.
   建筑师设计墙的中心线要直且平，以便于美观。