trisection compasses

例句：

1. 1. The artist used a compass to divide the canvas into three sections.
   这位艺术家用罗盘将画布分成了三个部分。
2. 2. The scientist used a compass to divide the earth into three continents.
   这位科学家用罗盘将地球分成了三个大陆。
3. 3. The engineer used a compass to divide the building into three floors.
   这位工程师用罗盘将大楼分成了三层。