Unpei云平UNabbr.(=United Nations) 联合国pron.<口>人，事物，家伙，东西undulating anticline波状背斜unmanned air vehicle无人机undisposed assets.未处理的财富undetermined methods待定法unfathered rumors.未确定来源的谣言unfavorable reaction不良反应unconformity surface不整合面unburned combustible未烧尽的可燃物unplanned blow-off无计划休风unreachable position盲点