Upstream Activation Sequence上游激活序列 User Agent Server用户代理服务器 Unloading Auger System卸载钻系统 User Account System使用者账户系统 User Agent String用户代理的字符串 Unavailable Seconds (Sprint)无法秒(冲刺) Upper Atmosphere Sensor大气的传感器 Uniform Asymptotic Solution统一的渐近解 Upflow Anaerobic Sludge升厌氧污泥 Urgent Action Survey紧急行动的调查 Unassigned (Telabs)Unassigned(Telabs) University of Agricultural Sciences, Bangalore大学的农业科学、班加罗尔 Universidad AutÓnoma de Sinaloa (Sinaloa, MÉxico)Universidad AutÓnoma de Sinaloa (Sinaloa, MÉxico) Urea-Ammonium SulfateUrea-Ammonium硫酸盐 Urban Airshed城市Airshed