音标:[,tetrə'pi'rɔlik] ;
adj.
tetrapyrrol的变形
tetrapyrrol
[,tetrə'pirəul; -pi'r-]
n.
【化学】四吡咯[亦作 tetrapyrrole]

This is Scientific American Sixty Seconds Science, I'm Sophie Bushwick, got a minute? When Mexican tetra fish moved into darker caves long ago, they evolved to deal with the dark by becoming albino and going blind. A new research shows that the chang

发表于:2018-12-24 / 阅读(239) / 评论(0) 分类 Scientific American(一)月

Egyptian archaeologists have discovered the bottom part of an unknown pyramid in the Sakkara area about 18 miles south of Cairo. NationalGeographic explorer-in-residence Dr. Zahi Hawass, the Secretary General of the Egyptian Supreme Council for Anti

发表于:2018-12-30 / 阅读(237) / 评论(0) 分类 国家地理2008年

Today, guest-writer Neal Whitman will help us understand why the word troops can refer to the number of individuals or groups. What Does Troops Mean? Memorial Day is next week, when we in the U.S. honor members of the military who have died in the li

发表于:2019-01-02 / 阅读(226) / 评论(0) 分类 英语语法 Grammar Girl

By Mario Ritter Broadcast: October 7, 2003 This is Doug Johnson with the VOA Special English Agriculture Report. Today we finish a two-part series. A listener in Brazil asked about 1)agroecology. This

发表于:2019-01-02 / 阅读(260) / 评论(0) 分类 VOA2003(下)-农业与经济

T Tanshinone IIA 丹参酮IIA Tanshinone I 丹参酮I Tanshinone IIB 丹参酮IIB Taraxasterol 蒲公英甾醇 Taraxerol 蒲公英赛醇 Tauro ursodesoxy cholic acid 牛磺熊去氧胆酸 Taxifolin 花旗

发表于:2019-01-03 / 阅读(227) / 评论(0) 分类 医务英语

By Mario Ritter Broadcast: September 30, 2003 This is Steve Ember with the VOA Special English Agriculture Report. This week, we take a suggestion from a listener in Brazil. Agricultural specialist Lu

发表于:2019-01-04 / 阅读(255) / 评论(0) 分类 VOA2003(下)-农业与经济

By Michael Kohn Kabul 19 October 2006 Houses in Murad Khane that will be restored by the Turquoise Mountain Foundation The neighborhood of Murad Khane in Kabul's Old City was once a wealthy area of merchants and members of the royal family. But afte

发表于:2019-01-06 / 阅读(300) / 评论(0) 分类 2006年VOA标准英语(十月)

By Cathy Majtenyi Nairobi 22 December 2006 In Somalia, Islamist fighters and government troops continue to battle each other near the government stronghold of Baidoa, with each side claiming to have killed hundreds of troops of the other side's. Cat

发表于:2019-01-12 / 阅读(239) / 评论(0) 分类 2006年VOA标准英语(十二月)

By Phil Mercer Sydney 19 April 2006 Residents watch the smoke rise in Honiara, the Solomon Islands capital, Wednesday, April 19, 2006 after a night of rioting in the aftermath of the election of Snyde

发表于:2019-01-13 / 阅读(258) / 评论(0) 分类 2006年VOA标准英语(四月)

By Jeffrey Young Washington 12 June 2007 To most Americans, the governments in their towns and regional areas, called counties, are the governments they interact with the most. And alongside these local governments are groups of citizens who work on

发表于:2019-01-16 / 阅读(231) / 评论(0) 分类 2007年VOA标准英语(六月)

Egyptian archaeologists have discovered the bottom part of an unknown pyramid in the Sakkara area about 18 miles south of Cairo. National Geographic explorer-in-residence Dr. Zahi Hawass, the Secretary General of the Egyptian Supreme Council for Anti

发表于:2019-01-22 / 阅读(237) / 评论(0) 分类 自然百科2008年

By Stephanie Ho Washington 15 November 2006 The non-profit group , One Laptop per Child has unveiled a low-cost, high-durability laptop computer that it says it wants to put into the hands of children across the globe. Children's laptop from One Lap

发表于:2019-01-31 / 阅读(274) / 评论(0) 分类 2006年VOA标准英语(十一月)

By Ernest Leong Washington, D.C. 10 November 2006 watch Gates profile Robert Gates, President Bush's nominee to become the new U.S. Defense Secretary, is a former CIA Director with decades of experience in the national security field. He has also se

发表于:2019-01-31 / 阅读(293) / 评论(0) 分类 2006年VOA标准英语(十一月)

By Cathy Majtenyi Nairobi 01 February 2007 Burundi has agreed to offer troops for the African Union peacekeeping initiative in Somalia. Meanwhile, Uganda's parliament is brushing aside attempts by the ruling party to push through a motion to send Uga

发表于:2019-02-01 / 阅读(232) / 评论(0) 分类 2007年VOA标准英语(二月)

Earlier this year, President Bush said the United States would spend $350 million over five years to fight seven of the world's most common parasitic and bacterial diseases affecting hundreds of millions of people in tropical regions of the world. A

发表于:2019-02-02 / 阅读(230) / 评论(0) 分类 VOA标准英语2008年(七月)

今天我们要学的词是robocall。 Robocall指的是由计算机系统自动拨号,播放事先录制的电话留言的宣传电话。Robocall是产品促销和政治竞选的常用手段。A GOP group launched its robocall campaign against Sen

发表于:2019-02-04 / 阅读(276) / 评论(0) 分类 英语每日一词

OMG! Congratulations to both of you!! How did he pop the question??OMG! 祝贺你们俩啊!!他怎么求的婚啊??

发表于:2019-02-06 / 阅读(215) / 评论(0) 分类 OMG美语

By Zulima Palacio, Cindy Saine Washington, D.C. 05 July 2006 Watch Protest Report Protestor A small group of about 15 people gathered in front of the Washington bureau of the New York Times Monday to protest the paper's publishing of what some call

发表于:2019-02-07 / 阅读(341) / 评论(0) 分类 2006年VOA标准英语(七月)

10 Getting The Lead Out 第十章 把铅撵出去 In the late 1940s, a graduate student at the University of Chicago named Clair Patterson (who was, first name notwithstanding, an Iowa farm boy by origin) was using a new method of lead isotope measur

发表于:2019-02-17 / 阅读(253) / 评论(0) 分类 万物简史
学英语单词
according to the dictates of common sense
acid feeder
all wave filter
alphin
anadrenalism
angularly independent mode
Aspelare
asset volatility
bashfully
bilbies
black bryony
building restiction line
caboshed
Calidris Ferruginea
censored observation
Clatonia lanceolata
code black
cold soldering
colo(u)r changing reaction
coronal process
crudzine
dead-point
differential tail
discriminative monopoly price
double weight hydrogen
engine data
floating point arithmetic
forewarningly
Gbatédji
gelatinity
gentledame
ghed-
gobelt cell
handle-type fuse
hemming
hoedown
hot mess
hot-rolling wastewater
ice condenser reactor containment
iliohypogastric nerve
impeller boss
imperial elephants
industry hygiene standard
infeed accumulator
initial delirium
iodobenzyl bromide
isoluminol
julia japonica
keying agent
korgen
lamb-chops
Latinizer
loll
long handle
Malacanthinae
miotto
nasal spine
Nizhneye Kuyto, Ozero
nondisjunctions
on-line retailer
opio
pancreas main islets
pandora shell
perforatorium
petro-currency
pitch diameter equivalent
plastic induration of the penis
Purkinje's experiment
roller cloth compressor
sanitary chemical analysis
Sasbach
scandura
screw auger
semicalcified
set an ambush for
shunted bilirubin
sinorniss
spread coating
straight downward-sloping lines
stress crystallinity
super satellite speed
supercharging boost
switch hook flash
tandem deck shaker
tea stem
tercios
tetradecendioic acid
Tinui
tolerated stress
trabeate
traction rope
two-layer columnar joints
under frequency protection
under-shepherd
upshocks
venter supremus
warlockry
weasands
weigh-bed
whistle-stop tours
xenates
yellow cat, yellow catfish