drawing jack

例句：

1. 3.
   在建筑中
2. 1. The artist needs a drawing jack to hold his sketchbook.
   这位艺术家需要一副绘图支架来支撑他的素描本。
3. 2.The engineer used a drawing jack to support the heavy steel beam.
   工程师使用绘图支架来支撑沉重的钢梁。
4. 3. During construction, the builders use drawing jacks to support the scaffolding.
   在施工期间，工人们使用绘图支架来支撑脚手架。