Ursan.[天]大熊星座；[天]小熊星座Urn.铀uramino-acetic acid[医] 脲乙酸Uronema confervicolum尾丝藻Urumqi Railway Bureau乌鲁木齐铁路局Uromyces glycyrrhizaen.甘草单胞锈菌uridine pyrophosphate尿(嘧啶核)苷焦磷酸酯uridine monophosphate尿甙酸,尿苷酸urogenitalis aparatus尿生殖器Ursus arctos Linnaeus棕熊Uromyces loculiformisn.腔形单胞锈菌Uronate dehydrogenase尿酸脱氢酶