U字頭
A: What would you ultimate vacation be?
B: I’d love to go to Europe
ultimate
a. 1.極端的，最大的，最高的；2。最後的，最終的
n. 終極，頂點，極限
A: It is really raining outside. Do you have an umbrella I could borrow?
B: Yes, feel free to take with you . I have another one that I can use.
umbrella
n. 雨傘
A: They didn’t uncover any evidence that would prove her guilty of the crime.
B: I’m not surprised, because I’m certain she is innocent.
uncover
vt. 1。揭露，暴露；2。揭開……的蓋子
A: He will have to undergo surgery to correct the problem with his knee.
B: Isn’t there an alternative?
undergo
vt. 經歷，遭受
A: What sort of training have you had as a teacher?
B: I did my undergraduate work in Child Psychology, and received my Mater’s degree in Education.
undergraduate
n. 大壆本科生
A: Where are the telephone lines located in this neighborhood?
B: My understanding is that they are all underground.
underground
a. 1。地（面）下的；2。祕密地，不公開地
ad. 1。在地（面）下，往地（面）下；2。祕密地，不公開地
n. 1。地鐵；2。地下組織（或運動）
A: Please underline all of the book titles in your paper.
B: Do I capitalize every word in the title of the books?
underline
vt. 1。在……下面劃線；2。強調，使突出
A: I’ve lost my shoes.
B: Have you looked the chair?
prep. 在……下面，在……底下
ad. 在下面，在底下
n. 下部，地部
A: Do you know when these reports are due?
B: My understanding is that we need to have them in by Friday.
understanding
n. 1。諒解，（非正式）協議；2。理解（力）；3。相互理解，融洽
a. 體諒的，寬容的，通情達理的
A: That’s a mighty big project to undertake in such a shout amount of time.
B: I know, but I really believe I can get it done.
undertake
vt. 1。承擔，著手做；2。同意，答應，保証
A: It’s really hard to undo a mistake like that one.
B: Maybe we could just start over.
undo
vt. 1。解開，松開；2。取消，撤消
A: Undoubtedly , there is still work to be done on this driveway.
B: I agree. After a rain, the ruts form all over again.
undoubtedly
ad. 無疑，必定
A: Why don’t you meet us for dinner in about an hour?
B: I’m sorry, but we have some unexpected visitors in town tonight.
unexpected
a. 想不到的，意外的
A: Unfortunately , I left my keys at home.
B: Don’t worry, I have an extra set.
unfortunately
ad. 遺憾的是，可惜的是
A: It’s hard to imagine anyone not being touched by the union of black and red in this painting.
B: The artist really did do an amazing job.
union
n. 1。工會，聯盟；2。結合，聯合，合並
A: You have unique way of expressing yourself that is very engaging.
B: Thank you. I really appreciate the complement.
unique
a. 1。唯一的，獨特的，獨一無二的；2。極不尋常的，極好的
A: There seems to be a unity on their team that is very effective.
B: I agree. They really know how to work together toward a common goal.
unity
n. 1。團結，聯合，統一；2。和睦，協調
A: The universal need for love ties all of humanity together.
B: What about the universal need for food?
universal
a. 1。普遍的，全體的；2。通用的，萬能的；3。宇宙的，全世界的
A: The universe is so large that it takes years to travel from one planet to another.
B: Perhaps with the new technologies things will happen faster.
universe
n. 1。宇宙，萬物，世界；2。領域，範圍
A: Unlike yesterday, the air seems very cold today.
B: I’m sure the wind chill factor is part of the reason.
unlike
prep. 不像，和……不同
A: If I unload the bricks from my car, I’ll have room for one more passenger.
B: Here, I’ll help you.
unload
vt. 1。卸（貨），從……卸下貨物；下（客）；2。退出（槍的）子彈，卸下（相機的）膠卷
vi. 卸貨；下客
A: It’s quite unusual to see deer crossing the highway.
B: They must be fleeing from hunters.
unusual
a. 1。不平常的，少有的；2。與眾不同的，獨特的
A: The upper end of town is much more populated than this part.
B: Maybe we should live here since there is less traffic.
upper
a. 上面的，上部的，較高的
A: If you sit upright it would help your posture and give you less back pain.
B: Thanks. I’ll give it a try.
upright
a. 1。直立的，豎立的，垂直的；2。正直的，誠實的
ad. 挺直著，豎立著
A: I am very upset that you left the dishes unwashed.
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