Uttn.厄特
UTabbr.世界时;格林威治时间(=Universal Time)abbr.超声试验(=Ultrasonic Test)
utilization ratio利用系数,实用比
utilizable energy可利用(热)能
utrodyne receiver中和接收机,中和接受机
Utreine leiomyoma子宫平滑肌瘤
"the girl felt motherly and useful"
"a useful job"
"a useful member of society"