eyepiece cross-hair

例句：

1. 1. The hunter used a cross-hair to aim his arrow at the target.
   猎人用十字准星瞄准靶子。
2. 2.The artist drew a cross-hair on the paper to help him draw straight lines.
   艺术家在纸上画了十字线，帮助他画出直线。
3. 3.The scientist used a cross-hair to measure the distance between two points on the map.
   科学家用十字线测量地图上两点之间的距离。