unkey[美俚]黑人老头子UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西untangle this mess消除混乱unbalanced regions区域非均衡untipped steel bit不镶刃的钢钻头undulation control波动控制unguentum phenolis[医] 酚软膏unlicensed hawking无照经营摊贩unrevoked contract未宣布为无效的合同uncontrolled state非控制状态unreligious morals世俗道德unrecognized state未被承认的国家