四角

例句：

1. 1.The quadrant of the map is labeled as North America.
   地图上的这个四边形区域被标记为北美洲。
2. 2.The scientist studied the quadrant of space that was unexplored by previous missions.
   这位科学家研究了太空中未被先前的航天任务探索过的那部分区域。
3. 3. The quadrant of the room where she was sitting was illuminated by the moonlight.
   她坐的那间房间的四边形区域被月光照亮。