Ungap不隔UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西undetermined parameters method待定系数法unweighted and weighted network无权和有权网络undifferentiated acute leukemia未分化急性白血病unfavorable balance of payments[经] 国际收支逆差unbalance distributed parameter不平衡分布参数unrecognizable invisible assets不可辨认无形资产unconfined compressive strength无侧限抗压强度Unclassified epileptic seizures未分类的癫痫发作unfired steam generating vessel非直接火蒸汽锅炉unexposed film length indicator未曝光胶片长度指示器