有效种数

There are six characteristics of speech, all of which are vital to speak effectively. In this section we'll look at each of them separately. These speech characteristics are basically important to you

发表于:2018-11-28 / 阅读(181) / 评论(0) 分类 疯狂英语2001年

BY STEPHEN R .COVEEY The first habit is 1)proactivity. Be proactive. The word proactivity is fairly common in management literature, but you won't find it in the dictionary. It means more than merely

发表于:2018-11-28 / 阅读(221) / 评论(0) 分类 疯狂英语2001年

Dima: Hi, welcome to this edition of 6 Minute English with me, Dima Kostenko Rebecca: and me, Rebecca Byrne. Hi. Dima: Today we'll be finding out how a small bee has become the cause of a big problem in the UK - and how an environmental organisation

发表于:2018-12-03 / 阅读(100) / 评论(0) 分类 一起听英语

VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Steve Ember. VOICE TWO: And I'm Barbara Klein. This week, we will tell about cancer. Health experts say it will soon become the world's leading killer. We also will present evidence

发表于:2018-12-07 / 阅读(132) / 评论(0) 分类 VOA慢速英语2009年(一)月

Scientists Fear Non-Pest Insects are Declinin Butterflies are as beautiful as the flowers they feed on.But they appear to be less abundant than in years past and that has scientists worried.Because butterflies, bees and other beneficial bugs pollinat

发表于:2018-12-08 / 阅读(92) / 评论(0) 分类 VOA标准英语2018年(九月)

[00:02.70]Unit 22 Environmental Protection Lesson 2 [00:08.46]Exercise 3 Listen to the lecture. [00:11.41]Use the Strategies to write some notes. [00:14.76]Today's lecture will focus on the serious issue [00:17.75]of endangered species. [00:19.90]By

发表于:2018-12-13 / 阅读(181) / 评论(0) 分类 北师大版高中英语模块8(选修)

By Melinda Smith Washington 31 August 2007 Centuries ago doctors used hypnosis to help relieve the excruciating pain of surgery. It then fell out of favor with the introduction of anesthesia. Now as VOA's Melinda Smith reports, new studies show a hos

发表于:2018-12-16 / 阅读(158) / 评论(0) 分类 2007年VOA标准英语(八月)

By Al Pessin Brussels 13 June 2007 U.S. Defense Secretary Robert Gates says the NATO alliance has demonstrated that it can be effective in Afghanistan in spite of continuing shortfalls in the number of troops member-nations are providing. VOA's Al Pe

发表于:2019-01-06 / 阅读(173) / 评论(0) 分类 2007年VOA标准英语(六月)

By Jessica Berman Washington 14 May 2008 Researchers have determined that commonly prescribed triple-drug combination therapies that use old antiviral drugs are the most effective for suppressing the deadly virus that causes AIDS. The findings have m

发表于:2019-01-09 / 阅读(139) / 评论(0) 分类 VOA标准英语2008年(五月)

GUY RAZ, HOST: I want to ask you about this really famous Talmudic notion - actually, it might be that in the Quran as well - but this idea that, you know, if you save a single life, then you have saved all of humanity. You know that one? PETER SINGE

发表于:2019-01-17 / 阅读(110) / 评论(0) 分类 2017年NPR美国国家公共电台5月

JINAN, May 14 (Xinhua) -- Chinese scientists said Saturday that they have found a new species of giant theropod dinosaur in the eastern province of Shandong. The new species, described as a close relative of Tyrannosaurus rex (T. rex), has been named

发表于:2019-02-05 / 阅读(132) / 评论(0) 分类 英语新闻

From the first weekend in May until July, hunters in New Zealand are allowed to shoot ducks for sport. This is called the duck shooting season. Hunters have to get a licence and can kill only a limited number of ducks each day. There are only three t

发表于:2019-02-08 / 阅读(92) / 评论(0) 分类 新西兰英语

Since the pre-historic times, man has had an urge to satisfy his needs. Be it hunger, shelter or search for a mate, he has always manipulated the circumstances to the best of his advantages. Probably this might be the reason why we human are the most

发表于:2019-02-13 / 阅读(109) / 评论(0) 分类 英语美文

Ornithological trends 英国鸟类迁徙趋势 This bird has flown 有所改变 Why some species are thriving outside southern England 为什么英格兰南部有些物种开始兴盛? WHEN people talk about a north-south divide in Britain they are

发表于:2019-02-17 / 阅读(94) / 评论(0) 分类 经济学人文艺系列

Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity,the number of species in a particular ecosystem,to the health of the Earth and human well-being

发表于:2019-02-19 / 阅读(167) / 评论(0) 分类 托福英语

Can Animals Count? 动物会数数? Can animals count? People count easily, from the time we are little kids and learn our one-two-threes. But what about other species? Careful observations in the wild support the idea that some can. The American c

发表于:2019-02-24 / 阅读(112) / 评论(0) 分类 英语听力文摘 English Digest

Yet there is surprisingly little agreement on how many phyla there are or ought to be. 然而,令人吃惊的是,在关于有多少门或诙有多少门的问题上,人们的看法大相径庭。 Most biologists fix the total at about thirty, b

发表于:2019-02-26 / 阅读(131) / 评论(0) 分类 万物简史

Goodness knows what the results would be if anyone attempted a similar exercise with the planet's estimated 20,000 types of lichens, 50,000 species of mollusk, or 400,000-plus beetles. 要是有人试图对这颗行星上的大约2万种地衣、5万多

发表于:2019-03-17 / 阅读(485) / 评论(0) 分类 万物简史

In principle you ought to be able to go to experts in each area of specialization, ask how many species there are in their fields, then add the totals. 原则上,我们可以去找一找每个专门领域的专家,问一问他们的领域里有多少

发表于:2019-03-17 / 阅读(465) / 评论(0) 分类 万物简史

Disputes and reorderings of much the same type can be found in all the other realms of the living, 同样的争吵,同样的重新分类,也发生在所有别的生物领域, so keeping an overall tally is not nearly as straightforward a matter

发表于:2019-03-17 / 阅读(384) / 评论(0) 分类 万物简史
学英语单词
Abel apparatus
abu nujaym
accumulated irradiation
aello
aircraft simulation test
amino-anisole
audio modulation detector
augen migmatite
Aveling's repositor
backing stores
bagni del masino
ballast work
be susceptible to
buckhalt
Buddleja lindleyana
chapelfell top
cofinal functor
Creegh
Cupressocyparis
definitly
deposited-carbon resistivity
diagonal action
diamond skin disease
dissector tube
Eastman Kodak Company
effective test/service start date/time
Elatostema salvinioides
end-in-himself
eupelmus formosae
explicitly
false tamarisk
ferroporphyrin
ferroprussic
flow decay
flow-limiting nozzle
Fort Loudoun Lake
fullkorper
goodeve
gravimetric measurement
green ware body
Grenzbegriff
Hagenheim
horsepower constant
Howesville
hypotrachyna keitauensis
in the picture
integrated file access method
Isaac's granules
karyorrhexis
kliff
laminae medullares
langacker
lightface
Liturgical Latin
long bridge vessel
Marshall Bennett Is.
mast thwart
memory access control
miyoko
neck thickness
NGLs
nonbioturbated
Norconessine
optimum environmental quality
outside call
parallel loop
patrocinio
pelters
percutaneous reaction
petrolero
phenmethyltriazine
polycose
program counter set
PSD (power spectral density)
quarter-back
quench
railway noise
ramus superfic. dors. n. lat. metaot.
redsensitive
REMF
renal cyst
research emphasis
ring drier
Ruqaybah
Sciez
self-driven line-scanning circuit
Sirnach
slap pile
sonmbulo
squaric
state power organs
Stephanus Johannes Paulus Kruger
SUBN
tasimeters
tied shop
Time is money
tool van
trein
uchigake
unneighborlinesses
valve-plane
venisuture