unmanned spacecraft

• 无人宇宙飞船

unmanned spacecraft的用法和样例：

例句

1. Nasa scientists have been outlining their preliminary results after crashing two unmanned spacecraft into the Moon in a bid to detect water-ice.
   美国航空航天局的科学家大致描述了他们将两艘五人宇宙飞船坠落到月球以探测水冰的初步结果。