Unere乌内雷UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unnotched type bearing无滚球槽的轴承uncoupling of vehicles车辆摘钩uncooled photodetector非冷却光电探测器Uncaria sessilifructusn.白钩藤unbalanced grid faults电网不对称故障unregulated flood flow未调节洪流undecomposed explosive未变质炸药uneforceable contracts不能执行的合同Undeveloped rural area贫困地区农村uncooperative attitude不合作态度