unnel隧道UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unheated blood products未经热处理的血制品undigested food residue未消化的食物残渣unfavourable impression不良印象uncontrollable variable不可控变量unrecognized government未被承认的政府unbalanced quoted price不平衡报价unregistered treademark[法] 未注册的商标unbalanced load current不平衡负载Un jour tu le toucheras总有一天你会触碰到uncertificated bankrupt无证书证明的破产, 无证明的破产