Unuma宇沼UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西untrustworthy person不可信赖的人unclassified gliomas未分类的胶质瘤unworked penetration工作前针入度unclaimed luggage.无人认领的行李unexplained abortion不明原因流产unpremeditated theft非预谋型盗窃(犯罪)unquenchable courage一往无前的勇气unblanking generator启通信号发生器unconfined shrinkage自由收缩unthinkable thoughts不可想象的想法; 难以置信的想法