UNEPabbr.United Nations Environment Programme 联合国环境规划署UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西unblocked traffic不断交unearned discount未获折扣undecylene diacid十一碳一烯二酸unremittable fund不能汇出的基金unbalanced output非对称输出,不平衡输出Unresponsive flow无响应流undee measurement波形测量unbalanced forces不平衡力unpolarized burst非偏振暴unneutral service非中立服务