A: Did he give you a choice of options?
B: No, he offered me no ultimatum .
ultimatum
n. 最后通牒
A: Ultraviolet light is harmful to our skin.
B: So you better wear some sunscreen when you are out in the sun.
ultraviolet
a. 紫外線的
A: Were you all able to come to a unanimous decision?
B: No, one person disagreed with us.
unanimous
a. 全體一致的，一致同意的
A: I didn’t think that you would be able to carry the heavy box.
B: Well, you shouldn’t have underestimated my strength.
underestimate
vt. 對(duì)……估計(jì)不足，低估
n. 估計(jì)不足，低估
A: I don’t understand the ideas that underlie your essay.
B: Oh, let me explain them again.
underlie
vt. 構(gòu)成……的基礎(chǔ)（或起因），引起
A: What is the underlying reason for doing this journey?
B: To explore a new region of the country.
underlying
a. 含蓄的，潛在的
A: Philip always undermines my opinions.
B: Don’t worry, he is just trying to start an argument.
undermine
vt. 1。暗中破壞，逐漸削弱；2。侵蝕……的基礎(chǔ)
A: Even my underwear got wet in the rain.
B: That must have been a heavy shower.
underwear
n. 襯衣，內(nèi)衣
A: Doctor, do I really need to undress ?
B: Well, I need to examine your back.
undress
vi. 脫衣服
vt. 除去……的衣服
n. ****（或半****）的狀態(tài)
A: There is a high rate of unemployment in my region.
B: But I hear that it is not as bad as last year.
unemployment
n. 失業(yè)，失業(yè)人數(shù)
A: Haven’t you finished the book yet?
B: No, the plot is just unfolding .
unfold
vi 1。展開(kāi)，打開(kāi)；2。顯露，展現(xiàn)
vt. 展開(kāi)，打開(kāi)
A: Let’s all sing a song.
B: Do you think that will help to unify our group?
unify
vt. 1。使聯(lián)合，統(tǒng)一；2。使相同，使一致
A: Gavin unleashed some nasty comments at me.
B: Don’t mind him, he is always rude.
unleash
vt. 1。發(fā)泄，發(fā)出；2。解帶子放開(kāi)
A: Did you hear the latest news?
B: No, can you update me on the details?
update
vt. 更新，使現(xiàn)代化
n. 最新信息
A: You always stick to your word.
B: Yes, I like to uphold my principles.
uphold
vt. 支持，維護(hù)，贊成，認(rèn)可
A: There was an uprising in my country in the 1920s.
B: Was that when you declared an independent nation?
uprising
n. 起義，*
A: There will be uproar if my homework is not submitted in time.
B: Oh, but you are usually such a good student.
uproar
n. 吵鬧，喧囂，*
A: I heard that some toxic uranium was dumped into the sea.
B: Yes, it is shocking news.
uranium
n. 鈾
A: There is a terrible smell of urine in this room.
B: I agree, but I don’t know where it is coming from.
urine
n. 尿
A: The usher directed me to the wrong seat.
B: Oh, I think that he has just started the job.
usher
n. 引座員，招待員，迎賓員
vt. 1。引，領(lǐng)，陪同；2。預(yù)報(bào)（……的來(lái)到），宣告；3，創(chuàng)始，開(kāi)辟
A: Can we make this dish for dinner tonight?
B: No, I don’t have the right cooking utensils .
utensil
n. 器皿，器具