unleda.UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unhairing cylinder去毛机刀轴unreferenced field未引用字段unvaluable species无价值树种unbunding software非附随软件untrivial solution非零解unbounded sequence无界序列uncongealable cell不冻电池unfulfilled defect充不满缺陷unbalanced bidding不平衡报价unbalanced samples样本不平衡