变构物,旋光异构物

发表于:2018-11-29 / 阅读(382) / 评论(0) 分类 迪斯尼儿歌第二集

RACHEL MARTIN, HOST: Hugh Hefner has died at the age of 91. He created Playboy magazine at his kitchen table in Chicago in the early 1950s. It became not only a brand but it came to symbolize a lifestyle, both glorified and despised, of lavish partie

发表于:2018-12-02 / 阅读(100) / 评论(0) 分类 2017年NPR美国国家公共电台9月

THIS IS AMERICA -January 21, 2002: Hawaiian Music By Paul Thompson VOICE ONE: The American state of Hawaii is a group of islands in the North Pacific Ocean. Its people, culture and music are different

发表于:2018-12-07 / 阅读(126) / 评论(0) 分类 This is America

THIS IS AMERICA -January 25, 2002: Three Mo' Tenors By Lawan Davis VOICE ONE: Music experts say more people are becoming interested in classical music because it is being presented in new ways by new

发表于:2018-12-07 / 阅读(117) / 评论(0) 分类 This is America

PEOPLE IN AMERICA -April 7, 2002: in-in-the-Face By Paul Thompson VOICE ONE: Now, the VOA Special English program, PEOPLE IN AMERICA. I’m Steve Ember. In the early days of the last century, an Ameri

发表于:2018-12-15 / 阅读(133) / 评论(0) 分类 People in America

This monument to Islamic heritage is getting a new lease on life. The Bou Inania Medersa or Koranic school was once an architectural jewel of the medieval city of Fes. But centuries of neglect have taken a toll. Restorers are cleaning layers of white

发表于:2018-12-30 / 阅读(154) / 评论(0) 分类 国家地理2007年

It is early evening and soon this amphitheater will be standing room only for the evening show. Bats, hundreds of thousands of Mexican Free-tailed bats, are hungry tornado that swirls out of New Mexico's Carlsbad Caverns each night in search of food.

发表于:2018-12-30 / 阅读(142) / 评论(0) 分类 国家地理2007年

Todd: Hey, Keri. Let's talk about summer. Kerri: OK. Todd: Do you like summer? Kerri: Yes, I do. Todd: OK. Why? Kerri: Because it's warm, and blue skies, and fluffy white clouds. Todd: That's true. Now, you grew up in Southern California. What was it

发表于:2019-01-02 / 阅读(91) / 评论(0) 分类 英语访谈对话

by Jason Marshall Weve spent the last few articles building our numerical vocabulary from the ground up. Today, were going to talk about something that sounds hard, but is actually pretty easy...and very useful too: the commutative property of additi

发表于:2019-01-02 / 阅读(179) / 评论(0) 分类 数学英语

THIS IS AMERICA - November 25, 2002: Thanksgiving By Jerilyn Watson VOICE ONE: It is one of America’s most popular holidays. It is a day for expressing thanks for the good things in life, especially

发表于:2019-01-02 / 阅读(186) / 评论(0) 分类 This is America

THIS IS AMERICA -December 9, 2002: Songs About American Cities By Shelley Gollust (Theme) VOICE 1: Most Americans have a city they like best. It may be the city they were born in. It may be the city t

发表于:2019-01-02 / 阅读(133) / 评论(0) 分类 This is America

johnJacobjingleheimerSchmid t JohnJacobjingleheimerSchmidt, Thatsmyname,too! WheneverIgoout, Thepeoplealwaysshout, johnJacobjingleheimerSchmidt! Da,da,da,da 提示: 重复四次,主歌部分越来越小声,但 da 部分越来越大声

发表于:2019-01-10 / 阅读(148) / 评论(0) 分类 Wee Sing In The Car

A: Can you tell me where it hurts? B: I am so glad they called you. It feels like something is really wrong with my stomach! A: Does it hurt when I push here? B: Its mostly on my right side. Right here! A: Have you been feeling this way for awhile? B

发表于:2019-01-15 / 阅读(125) / 评论(0) 分类 英语情景对话-健康

PEOPLE IN AMERICA -June 30, 2002: Lou Gehrig By Jeri Watson ANNCR: Now, the VOA Special English program, PEOPLE IN AMERICA. A North American Major League baseball record was established in Nineteen-Th

发表于:2019-01-25 / 阅读(150) / 评论(0) 分类 People in America

PEOPLE IN AMERICA – August 4, 2002: Ann Landers By Caty Weaver VOICE ONE: I’m Mary Tillotson. VOICE TWO: And I’m Steve Ember with the VOA Special English program PEOPLE IN AMERICA. Today, we tel

发表于:2019-01-30 / 阅读(289) / 评论(0) 分类 People in America

What do the Big Apple and Sin City have in common? According to a recent survey, they're both among the hippest places in the world. In fact, New York City and Las Vegas are the two coolest cities in the US, tied for the No. 1 spot in annual measure

发表于:2019-02-03 / 阅读(141) / 评论(0) 分类 实用英语

夏日的阳光为何总是如此钟爱斯堪迪纳维亚的瑞典?虽然我的地理知道告诉我,瑞典并非我想象中般温暖宜人,但the charade的首张 专辑却将明媚的阳光散落在我的心坎。这样优秀的专辑常常是容易被人遗忘的,我想为自己的twee pop倾向找一个适当 的理由,然而我找到理由总是

发表于:2019-02-05 / 阅读(158) / 评论(0) 分类 音乐咖啡厅

Halloween Comes to AmericaAs European immigrants came to America, they brought their varied Halloween customs with them. Because of the rigid Protestant belief systems that characterized early New England, celebration of Halloween in colonial times w

发表于:2019-02-09 / 阅读(175) / 评论(0) 分类 英美文化

An astronomer used to walk out every night to gaze upon the stars.It happened one night that,as he was wandering in the outskirts of the city,with his whole thoughts rapt up in the skies,he fell into a well.On his holloaing and calling out,

发表于:2019-02-17 / 阅读(167) / 评论(0) 分类 趣味英语

From the far reaches of Alaska to the Gulf coast, Americans on Wednesday will celebrate Independence Day - the 236th anniversary of the Declaration of Independence from British rule. Tens of millions of small-town Americans and city dwellers alike wi

发表于:2019-02-19 / 阅读(133) / 评论(0) 分类 英语新闻
学英语单词
A bully is always a coward.
a fart face
adenoid
affinely connected manifold
armed element
autogenous pressure welding
bank post remittance
body therapy
bosom mischief
boycrush
Bulbilis dactyloides
burnishing shell
cell proliferation kinetics
changer
Cheyenne County
cholicky
coarse porosity
common myrrh
commoving
Compaq Computer Corporation
consumer geography
Cunila origanoides
curtail schedule
curtle
Daylab
destorying of evidence
Deutscher
dispapalize
drowned continent
emergency bus
Englishy
explorationists
flow channel
formosan muntjac
frequency modulation receiver deviation sensitivity
fuel tape
Gadsden
grow too big for one's pants
high temperature superconductivity
horse-pistols
Ilex aculeolata
inoes
interconnecting switching center
jodice
joint security area
JTFOA
Karakoro
kissed and made up
Konevo
line of drafe
liner pool
long-distance transmission
mesoporphyrin
metallic spatula
meteorologian
moist detector
motionable
multiple switch-board
multiprocessor priority
naphthalene ball
neutron-induced thermal stress
Newton's first law
non-drawout relay
nontherapeutic
on the lay
on-highway truck
over-deal
over-generalization
parades and changes
Planet B
post-maximum spectrum
potelle
powder character
ppm (part per million)
preform electrode
program block spectrum
propulsion
sales region contribution statement
scan plotter
Scheffau
secondary audience
shape of the seed
short title catalog
single plane balancing
soakers
spreads-out
stand a chance
swill feeding
T and E
theatral
three-pole double-throw switch
tiderode
total wars
universal inter face
vibrocast
Vindelgransele
whey mucoid
wofulness
zombie computer