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uncover 揭开，揭露 ～ a dish of food underestimate低估 ～ the difficulties of the task undergo 经历，遭受，忍受 ～ much suffering underlie 位于之下 Many facts ～ my decision undermine 在下挖 ～ a wall undertake 着手做， 从事 ～ an attack undesirable 不合意的，不受欢迎的 The drug has ～ side effects uneasy 心神不宁的，不安宁的 be ～uneasy about the future unfold 展开，打开 ～ a newspaper uniform 不变的，相同的，均匀，统一的 a ～ temperature unify 使成一体，统一 become a unified nation update 更新，使现代化 ～a textbook upgrade 提高，使升级，改善 ～ products and services uphold 举起，高举 He upheld his clenched hand upright 挺直的，垂直的 an ～ seat uproar 骚乱，骚动The public ～ over unclear-radiation hazards continues to mount upset 弄翻，打翻 Ive ～ a tin of paint on the carpet up-to-date 时新的，新式的，现代化的They are ～ on recent developments in the world computer industry urge 推进，鼓励 The president ,～d on by his staff, has decided to attend the talks | 
