It was the first of several orbiters that are surveying the cold, barren landscape, looking especially for signs of water and relaying signals from the two robotic rovers crawling over the terrain.

• 这是人造卫星首次探索这个寒冷，荒芜的星球，主要是为了寻找水的迹象，通过两个在地面上徐徐前进的机器人漫游者来传送信号。