1. tumble v. 跌到，翻滾(stumble絆倒)

In her hurry she tumbled down.

她在匆忙中跌倒。

The stream tumbled over the rocks.

溪水滾滾流過巖石。

2. turbulent a. 混亂的

She tried to calm her turbulent thoughts.

她試圖平息一下紊亂的思緒。

3. unanimous a. 一致的

The Chinese are unanimous in their condemnation.

全中國人民一致提出譴責(zé)。

4. underestimate v. 低估

Don't underestimate the difficulties of the work.

不要低估了這項工作的艱巨性。

5. undermine v. 暗中破壞

They will do anything to undermine their adversary's reputation.

他們會不擇手段地去損害對手的名譽(yù)。

6. undergo v. 經(jīng)歷

undergo great changes ?經(jīng)歷巨變

詞義辨析：undergo, experience, sustain, suffer

?undergo: 多指經(jīng)受艱難、痛苦、不愉快或危險等事

?experience: 指親身經(jīng)受或體驗?zāi)呈?/p>

?sustain: 指遭受痛苦或承受負(fù)擔(dān)

?suffer: ?？膳csustain通用，尤指受到損害或傷害

I hope that I shall never again have to undergo such unpleasant experience.

我希望我永遠(yuǎn)不會再遭遇到這種不愉快的經(jīng)歷。

7. underlying a. 潛在的

This word has its underlying meaning.

這個單詞有它潛在的含義。

8. uphold v. 支持

uphold world peace ?維護(hù)世界和平

詞義辨析：back, uphold, support, sustain, advocate

?back: 通常指對論點(diǎn)、行動、事業(yè)等的強(qiáng)有力支持

?uphold: 既可指積極努力對陷入困境者的支持，也可指給某人在行動、道義或信仰上的支持

?support: 含義廣泛，多指在道義上或物質(zhì)上支持某人，也可指對某項事業(yè)的支持

?sustain: 側(cè)重指連續(xù)不斷的支持

?advocate: 多指通過寫文章或發(fā)表演說等來支持或擁護(hù)，往往暗示提倡某事或為某事辯護(hù)

He proffered to uphold justice.

他表示愿意維護(hù)正義。

9. vent n. 排放口

give vent to ?發(fā)泄

She gave vent to her indignation in a fiery speech.

她在一篇激烈的演說中發(fā)泄怒氣。

10. verge n. 邊緣=brink

on the verge of bankruptcy 在破產(chǎn)的邊緣

Large numbers of people had to struggle on the verge of starvation.

許多人不得不掙扎在饑餓的邊緣。

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