ugly adj. unpleasant to see 丑陋的，难看的
UK n. abbrev.. United Kingdom (of Great Britain and Northern Ireland) (大不列颠及北爱尔兰) 联合王国
umbrella n. an arrangement of cloth over a folding frame with a handle, used for keeping rain off the head 伞，雨伞
unable adj. not able; without the power, knowledge, time, etc., to do something 不能的；无能为力的；不胜任的；没时间做的
uncertain adj.1. not certain; doubtful 不确定的；不明确的；可疑的
