mason's line

例句：

1. 1. Themason's line is the firstthing we need to check when we builda wall.
   砌砖工人的线条是我们建造墙壁时首先需要检查的东西。
2. 2. Themason's line was carefully markedon the wall before the work began.
   在工作开始之前，砌砖工人的线条被小心地标记在墙上。
3. 3. Themason's line helped us toensure that the walls were straight and level.
   砌砖工人的线条帮助我们确保墙壁是直的和水平的。