1. tumble v. 跌到，翻滚(stumble绊倒) In her hurry she tumbled down. 她在匆忙中跌倒。 The stream tumbled over the rocks. 溪水滚滚流过岩石。 2. turbulent a. 混乱的 She tried to calm her turbulent thoughts. 她试图平息一下紊乱的思绪。 3. unanimous a. 一致的 The Chinese are unanimous in their condemnation. 全中国人民一致提出谴责。 4. underestimate v. 低估 Don't underestimate the difficulties of the work. 不要低估了这项工作的艰巨性。 5. undermine v. 暗中破坏 They will do anything to undermine their adversary's reputation. 他们会不择手段地去损害对手的名誉。 6. undergo v. 经历 undergo great changes 经历巨变 词义辨析：undergo, experience, sustain, suffer undergo: 多指经受艰难、痛苦、不愉快或危险等事 experience: 指亲身经受或体验某事 sustain: 指遭受痛苦或承受负担 suffer: 常可与sustain通用，尤指受到损害或伤害 I hope that I shall never again have to undergo such unpleasant experience. 我希望我永远不会再遭遇到这种不愉快的经历。 7. underlying a. 潜在的 This word has its underlying meaning. 这个单词有它潜在的含义。 8. uphold v. 支持 uphold world peace 维护世界和平 词义辨析：back, uphold, support, sustain, advocate back: 通常指对论点、行动、事业等的强有力支持 uphold: 既可指积极努力对陷入困境者的支持，也可指给某人在行动、道义或信仰上的支持 support: 含义广泛，多指在道义上或物质上支持某人，也可指对某项事业的支持 sustain: 侧重指连续不断的支持 advocate: 多指通过写文章或发表演说等来支持或拥护，往往暗示提倡某事或为某事辩护 He proffered to uphold justice. 他表示愿意维护正义。 9. vent n. 排放口 give vent to 发泄 She gave vent to her indignation in a fiery speech. 她在一篇激烈的演说中发泄怒气。 10. verge n. 边缘=brink on the verge of bankruptcy 在破产的边缘 Large numbers of people had to struggle on the verge of starvation. 许多人不得不挣扎在饥饿的边缘。
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