带约束极值问题

A: I was supposed to meet with you at 1:30. B: Yes, I see. What did you need to see me about? A: There's a problem with my schedule. B: What's the problem? A: Two of my classes occur at the same time. B: Well, I can see that's a problem. A: Is it at

发表于:2018-11-30 / 阅读(216) / 评论(0) 分类 英语情景对话-大学生活

A: I have an appointment for 1:30. B: What can I help you with? A: Well, I have a problem with my class schedule. B: What is it? A: It seems that I've been given two classes scheduled at the same time. B: I can understand the problem with that. A: Is

发表于:2018-11-30 / 阅读(167) / 评论(0) 分类 英语情景对话-大学生活

Dialogue13 1--You're the only person who knows what really happened. 2--That's not quite true. Stan Bailey was there,too. 3--Oh. Was he there? I didn't know that. 2--Well, actually, he wasn't there al

发表于:2018-12-10 / 阅读(142) / 评论(0) 分类 英语经典听力对话

Al-Awlaki's Death Leaves Gap in al-Qaida The death of a senior al-Qaida figure by a U.S. air strike in Yemen leaves a gap in the senior ranks of what counterterrorism officials say is the most lethal of the group's franchises, Al-Qaida in the Arabian

发表于:2018-12-16 / 阅读(115) / 评论(0) 分类 VOA标准英语2011年(十月)

A: What can I help you with today? B: I need to talk to you about transferring. A: Where did you want to transfer to? B: I have no idea. A: You have plenty of time to think about it. B: What do I need to do in order to transfer? A: Youre going to nee

发表于:2018-12-17 / 阅读(91) / 评论(0) 分类 大学英语对话

What I want to talk to you about today is 我今天想要谈的是 virtual worlds, digital globes, the 3-D Web, the Metaverse. 虚拟世界,数字地球,三维网络和网络虚拟实境. What does this all mean for us? 这些东西对于我们意味着

发表于:2018-12-18 / 阅读(112) / 评论(0) 分类 TED演讲科技篇

A: Good morning, is this Ryan? B: You are speaking with Ryan. How can I help you? A: Ryan, this is Malia, and I need to call in sick today. B: What seems to be the problem? A: I went hiking and have terrible poison oak. B: When did you get that? A: I

发表于:2019-01-10 / 阅读(76) / 评论(0) 分类 英语情景对话-健康

By Nico Colombant Kano, Nigeria 18 April 2007 A police official in northern Nigeria says security forces have chased away foreign religious radicals outside the main city of Kano, restoring order ahead of Saturday's presidential election. The clashes

发表于:2019-01-12 / 阅读(135) / 评论(0) 分类 2007年VOA标准英语(四月)

Well, it's the relative importance. 就是二者间的相对重要性。 You would say-yeah, yeah, yeah, we all know this;water covers twice the area of the planet than dry land. 也许你会说,是,是,是,我们都知道,地球上水覆盖的

发表于:2019-01-18 / 阅读(100) / 评论(0) 分类 TED演讲娱乐篇

A: Can we talk? B: What about? A: Im not too clear on some things about my lease. B: Is there a problem? A: How many years is my lease for? B: In three years your lease will be up. A: Can I move out before those three years? B: If you do, I will keep

发表于:2019-01-20 / 阅读(105) / 评论(0) 分类 地道英语对话-租房

A: I would like to talk to you, if you have time. B: Whats going on? A: I want to discuss some things about my lease. B: What arent you too sure about? A: Can you tell me when my lease is up? B: Your lease is for three years. A: If I ever decide to l

发表于:2019-01-20 / 阅读(100) / 评论(0) 分类 地道英语对话-租房

A: Hi, is this the water company? B: This is the water company. May I help you? A: As a matter of fact, you can. B: What do you need? A: In a few days, Im going to be moving. B: Okay, and what do you need help with? A: Im going to need the water turn

发表于:2019-01-20 / 阅读(114) / 评论(0) 分类 地道英语对话-租房

A: Am I speaking with someone from the water company? B: Yes. Can I assist you with something? A: I certainly hope so. B: Whats the problem? A: I will be moving into a new house in a few days B: What exactly do you need my help with? A: Ill need you

发表于:2019-01-20 / 阅读(124) / 评论(0) 分类 地道英语对话-租房

A: I have a problem that needs fixing immediately. B: What is it? A: I think that a pipe broke in my ceiling. B: How do you know? A: The ceiling is wet and water is dripping onto my carpet. B: Your apartment isnt flooded, is it? A: Not yet, but my ca

发表于:2019-01-20 / 阅读(101) / 评论(0) 分类 地道英语对话-租房

A: Im calling about a problem with my apartment. B: Tell me what the problem is. A: There must be a leaking pipe in my ceiling. B: Are you sure? A: There is water leaking from my ceiling. B: Is the water flooding your apartment? A: Its not flooding,

发表于:2019-01-20 / 阅读(116) / 评论(0) 分类 地道英语对话-租房

A: Is Alice available? B: You're talking to her. A: I've called you a hundred times today. B: I was busy doing something. I apologize. A: No problem. B: Did you need something? A: Did you want to do something tomorrow? B: Is there somewhere special y

发表于:2019-01-20 / 阅读(139) / 评论(0) 分类 英语闲谈

Todd: Now Jason, you're an artist. Jason: That's right, yep. Todd: What kind of artist are you? Jason: I draw all sorts of things, but mostly I like to draw on the computer, using photoshop. Todd: Oh, really. Jason: Things like that. Todd: OK, was it

发表于:2019-02-05 / 阅读(138) / 评论(0) 分类 原版英语对话1000个

By Heda Bayron Hong Kong 17 August 2007 The global financial turmoil continues, with another bruising trading day in Asia. Analysts say investors are worried the credit crisis in the United States will slow down the economy and hurt Asian exporters.

发表于:2019-02-07 / 阅读(130) / 评论(0) 分类 2007年VOA标准英语(八月)

The Prime Ministers of Hungary and Slovakia have agreed to tackle extremism as part of efforts to overcome their countries' worst diplomatic crisis in years. They made the announcement following a meeting at the Hungarian-Slovak border Thursday. Bot

发表于:2019-02-12 / 阅读(134) / 评论(0) 分类 VOA标准英语2009年(九月)

In the small village of Lasanayah, Mamadou Kalissa looks out over his ancestral home. 在Lasanayah的一个小村庄里,马马杜卡利萨朝着自己的老家看去。 Last year it was farmland but now bauxite mining has turned it into a Martian l

发表于:2019-02-24 / 阅读(138) / 评论(0) 分类 经济学人商业系列
学英语单词
abdominal pain during pregnancy
absorbing boundary equation
accelerated testing
achievement model
air-atomic
Aleutian
Allium sphaerocephalum
allozymic
Alnwick
alternate level
American Wirehair
anax guttatus
antuan
argue sb into doing sth
arteriogenic
Auma
balanced impedance
bhans
brisant
calculating punch
camber correction tool
Campylotropis capillipes
carr-saunders
chaplains
Chazelles
chitodextrinase
chrysosoma falcatum
coimmunoprecipitating
community medicine
completely specified automata
compound relay
compressor wheel
constant multiplier unit
cosmeticise
courtneidges
cow-shard
cremant
DEA (deaerator)
deflowering
diatessaron
diathermal wall
dotted sixteenth note
dynamic programming
e-recruiter
electric spot welding
equiaffine
equivalence of expression
error correction coding
exopods
factors out
falling volt-ampere characteristic
family podargidaes
feed cam
Fructus Jujubae Saccharatus
fuel pool filter-demineralizer
gallopade
general purpose keyboard and display control
goal-oriented inference
heterotrophic fixation
hexichol
hitching of rope
holding-back
intracompany price
koste
Leakoff
linear delta modulation
Lysimachia rubiginosa
macroglossum ungues cheni
measurement of reflection factor
Mesra
moon phase hand
motzer
mulga wires
multielectrode valve
new years's banguet
nighy
nonimmune anemia
pathological reflex
Plaju
pouillyfuisse'
presteady state
radioisotopic generator
repastes
ribboner
rush period
RVRC
Saint Mary
sand reclaimation system
scaffold frame
secondlaw of thermodynamics
skid resistance
story of my life
systen
tertiary thickening
threff
unburned charge
unlawful homicide
unquestioned owner
v/q
vesiculovirus vesicular stomatitis virus
Windows Remote Management
zygotic lethal gene