UNSCOMn.联合国特委会unsadj.不对称的unsymmetric gear profile非对称齿廓unsuppressible-literal不可删文字unstructured information非结构化信息unstability of base line基线不稳unstructured environment非结构环境unsymmetrical characters不对称特征Unscrew an electric bulb将灯泡旋转下来unstructured programming[计] 非结构化程序设计unswitched socket outlet不连开关掣插座unspeakable happiness.无以言喻的幸福