Upstageadj. 骄傲的, 高傲的 Unserviceableadj. 无用的, 不实用的, 无益的 Undersiden. 下面 User/Station用户/站 Under Saddle (equestrian term for a show class that doesn't include jumping over fences)在鞍座(马术术语,指的是展示课,不包括跳过栅栏) Upstream (Process Engineering)上游(工程) UltraSonicadj. 超声波的 UnderSectionUnderSection