on draughtboard

例句：

1. 1. The engineer drew a detailed blueprint on the draughtboard.
   工程师在草图板上绘制了详细的蓝图。
2. 2. The architect was working on the drawings for the new building on the draughtboard.
   建筑师正在草图板上为新建筑绘图。
3. 3. The designer used the draughtboard to make preliminary sketches of the project.
   设计师使用草图板制作了项目的初步草图。