1、The astrogator calculated the optimal trajectory for the spacecraft's journey to the outer planets.
星际导航员计算了航天器飞往外太空行星的最佳轨迹。

2、The astrogator's expertise in celestial navigation was crucial for the success of the mission.
星际导航员在天体导航方面的专业知识对任务的成功至关重要。