unsewvt.拆除...之线unsadj.不对称的unsymmetrical pressure偏压unsmoothed curve chart未修平曲线图unsubstituted aromatic未取代的芳香化合物unshielded arc welding无保护电弧焊,无保护层电弧焊unsuited to each other枘圆凿方Unsustainable momentum缺乏后劲unsaturated polyyester不饱合聚酯树脂unstructured interview口头审查unstructured situation非结构性情景unsubstituted aromatics未取代的芳香烃