sighting colors

例句：

1. 1.The scientist conducted a thorough sighting of the new moon.
   科学家对新月进行了彻底的观测。
2. 2. The pilot performed a successful sighting of the airport before landing.
   飞行员在降落前成功地目视到了机场。
3. 3.The astronaut made a critical sighting of the planet Mars during their mission.
   宇航员在任务中目视到了火星这颗行星。