UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unhopedadj.<罕> = unhoped-for

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。