unsayvt.取消；撤回(说过的话)unsadj.不对称的unstressed curvature无应力曲率unsupervised pattern无监督模式unsynchronized sound声画分立unsupported distance自由长度unsymmetrical scalar不对称标量unsaturated impurity不饱和杂质unstructured smectic无结构近晶状结晶的unstabilizing factor不稳定因素unserved energy cost缺电成本unstructured overlay非结构化overlay