tyre/tire
tyre/tire/taiə/n.［c］轮胎：a flat tyre瘪了的轮胎；pump air into/pump up a tyre给轮胎打气Tyres are usually made of rubber.轮胎通常是用橡胶制成的。
ugly
ugly/ˈʌɡli/adj.1.难看的，丑陋的：an ugly duckling丑小鸭；ugly deed丑行2.险恶的，不祥的，不愉快的：ugly words难听的话；an ugly task讨厌的工作；ugly news叫人难过的消息；an ugly si···
ulcer
ulcer/ˈʌlsə/ I.n. [c] 1.（医）溃疡：She had an ulcer in her mouth.她口腔出现溃疡。My father suffered from stomach ulcer for a long time.我父亲患胃溃疡已经很长时间。2.道德败坏，腐···
ultimate/ultimatum
ultimate/ˈʌltimit/adj.最后的，最终的：the ultimate ends of the earth天涯海角Their ultimate victory is not in question.他们最终取胜是毫无问题的。ultimatum/ˌʌltiˈmeitəm/n.［c］···
ultraviolet
ultraviolet/ˈʌltrəˈvaiəlit/adj.紫外(线)的：ultraviolet rays紫外线；ultraviolet detector紫外线检测器；ultraviolet reflection紫外线反射
umbrella
umbrella/ʌmˈbrelə/n.［c］1.雨伞：open (shut) an umbrella撑(收)雨伞Take an umbrella in case of rain.带把雨伞以防下雨。2.保护伞：under the umbrella of在…的保护下
unable
unable/ˈʌnˈeibl/adj.(［反］able)不能的，不会的(后接动词不定式)：be unable to understand不能理解；be unable to attain one’s objectives不能达到目标
unanimous
unanimous/ju(:)ˈnæniməs/adj.全体一致的，一致同意的：unanimous consent一致同意The country is unanimous in its support of the Government’s policy.全国一致支持政府的政策。
unbutton
unbutton/ˈʌnˈbʌtn]/vt.解开…的钮扣；使松弛：She unbuttoned her coat.她解开了外衣的扣子。Unbutton a little, Molly.莫莉，放松点！
unbearable/unbearably
unbearable/ʌnˈbɛərəbl/adj.(［反］bearable)不堪忍受的，难堪的，不能容忍的：unbearable pain难以忍受的疼痛The heat was unbearable.热的受不了。His arrogance made him absolutely un···
