[医] 肠套迭

A hundred years ago, there are one and a half billion people on earth. Now, over six billion crowd our fragile planet. But even so, there are still places barely touched by humanity. This series will take you to the last wildernesses and show you the

发表于:2018-12-03 / 阅读(82) / 评论(0) 分类 探索与发现2012年

The penguins stay when all other creatures have fled because each guards a treasurea single egg rested on the top of its feet and kept warm beneath the downy bulge of its stomach. There is no food and no water for them. And they will not see the sun

发表于:2018-12-27 / 阅读(85) / 评论(0) 分类 探索与发现2012年

They are constantly on the move. New-born calves have to be up and running the day they are born. But the vast herds do not travel alone. Wolves. Packs of them, eight to ten strong, shadow the migration. And they are hungry. Its the newly born calves

发表于:2019-01-23 / 阅读(96) / 评论(0) 分类 探索与发现2012年

But they are hungry and eager to reach their mother whos delayed feeding them on this special day. Now she lures them with the promise of milk, the only food the cubs have known since they were born, deaf and blind beneath the snow some two months ag

发表于:2019-01-23 / 阅读(98) / 评论(0) 分类 探索与发现2012年

Day 10. And the mother has let her cubs a mile from the den. Its time to put them to the test. Theyve grown enormously in confidence, but they dont have their mothers sense of urgency. At last it seems that they are ready for their journey. And they

发表于:2019-01-23 / 阅读(87) / 评论(0) 分类 探索与发现2012年

Midsummer on the tundra and the sun does not set. At these altitudes, the suns rays are glancing and not enough of their energy reaches the ground to enable trees to grow. Youll need to travel five hundred miles south from here before that is possibl

发表于:2019-01-23 / 阅读(88) / 评论(0) 分类 探索与发现2012年

As we travel south, so the suns influence grows stronger. And at 50 degrees of latitude, a radical transformation begins. Summers here are long enough for broadleaf trees to replace conifers. Broadleaves are easier to eat and digest, so now animals c

发表于:2019-01-23 / 阅读(104) / 评论(0) 分类 探索与发现2012年

The advance of the seasons brings constant change. As the suns influence diminishes in the north, so the deciduous forests of America begin to shut down, losing their leaves in preparation for the dark, cold months ahead. One season hands over to ano

发表于:2019-01-23 / 阅读(81) / 评论(0) 分类 探索与发现2012年

The character of the forest changes as we descend, becoming ever darker and damper, favoring different kinds of animals and plants. Less than two percent of the sunlight reaches the floor. But even here there is extraordinary variety. In the Great Is

发表于:2019-01-23 / 阅读(78) / 评论(0) 分类 探索与发现2012年

The female retires to consider her verdict. Its hard not to feel deflated when even your best isnt good enough. The sun influences the lives in the ocean just as it does on land. Its richest parts are those where waves and currents bring fertilizing

发表于:2019-01-23 / 阅读(111) / 评论(0) 分类 探索与发现2012年

The strike of a great white shark lasts a mere second. Slowing it down forty times reveals the technique and immense strength of this massive predator. If surprise fails, there will be a chase. The shark is faster on a straight course, but it cant tu

发表于:2019-01-23 / 阅读(194) / 评论(0) 分类 探索与发现2012年

The sun beating down on tropical waters powers the weather systems of the globe. Moisture evaporates from the warming ocean and rises to create great storms. The winds generated out at sea sweep inland across the continents. As they travel across the

发表于:2019-01-23 / 阅读(78) / 评论(0) 分类 探索与发现2012年

Deer are frequent casulties of the harsh winter. And these leopards are not above scavenging from a corpse. African leopards could never survive here. But the Russian cats have thick fur to shied them from the cold. There are only 40 Amur leopards le

发表于:2019-01-23 / 阅读(111) / 评论(0) 分类 探索与发现2012年

Their secret is teamwork. Impala are their favourite prey. They start to hunt and the pack splits up. An aerial viewpoint gives a new insight into their strategy. As the dogs approach their prey, they peel off to take up separate positions around the

发表于:2019-01-23 / 阅读(73) / 评论(0) 分类 探索与发现2012年

The dogs know their prey must come out or drown. Now its a waiting game. The rest of the pack are calling. Theyve made a kill in the forest and this is an invitation to join in the meal. The impala is in luck. A pack this size kills once a day and ev

发表于:2019-01-23 / 阅读(82) / 评论(0) 分类 探索与发现2012年

All across southern Africa, all animals are journeying for the same reason. Buffalo join the great track. Nowhere else on Earth are so many animals on the move for the same urgent purpose. They are all heading for the swamps of the Okavango, a vast i

发表于:2019-01-23 / 阅读(91) / 评论(0) 分类 探索与发现2012年

At the peak of the dry season in the Kalahari, water arrives in the Okavango. It fell as rain a thousand miles away in the highlands of Angola and has taken nearly five months to reach here. The water drives out insects from the parched ground which

发表于:2019-01-23 / 阅读(76) / 评论(0) 分类 探索与发现2012年

By Lisa Bryant Paris 21 November 2007 A French judge has put former president Jacques Chirac under formal investigation for suspected embezzlement during his 1977-1995 tenure as Paris mayor. For VOA, Lisa Bryant reports from the French capital the ma

发表于:2019-01-31 / 阅读(106) / 评论(0) 分类 VOA常速英语2007年(十一月)

My most embarrassing moment was probably when I lived in Germany. One day I decided to go shopping and I drove into town. I had a car. And I was very, very pleased because I found a parking space immedately which was rather unusual. I did my shopping

发表于:2019-02-05 / 阅读(84) / 评论(0) 分类 原版英语对话1000个

My most embarrassing moment was probably when I lived in Germany. One day I decided to go shopping and I drove into town. I had a car. And I was very, very pleased because I found a parking space immedately which was rather unusual. I did my shopping

发表于:2019-02-17 / 阅读(90) / 评论(0) 分类 英语访谈对话
学英语单词
a quo
access network
air-driven dermatome
andorra kernel language
anthropophonic
applied linings
arouse a nest of hornets
asimow
bran fragment
breathing regulator
Call Risk
charge-ahead
Chaves County
cigaro
coilgun
cold-pressing property
collectibles
compensating-field winding
compound harmonic motion
conduction oil
congenital persistence of pupillary membrane
congresses of racial equality
contour of equal loudness
coparent
correlative conjunction
cursitor
deer-lick
East Canton
establish contact
evaporation of electrons
exerpt
fahrvergnugen
flashing jack
flexiboard
functioning machinery
genus Beta
get your just deserts
gradation scale
guzzardi
HEALPix
hing joint
holoway
hooses
interference (of waves)
junglier
kuhlthau
lakish
main logic
Maksimovo
marchenko
marginal sterilization
maximum effective rate
Meehania urticifolia
millimeter wave filter
missile-launchers
mushroom anchors
nautical knowledge
new method
Nicotiana longiflora
nucleus transplantation
optimus prime
orbiculociliary fibers
oversharers
oversteep
p27kip1
pay supplement
pickfords
prestosuchids
process simulator
pseudovalve carpel
quarterline
reel stopper
rhinoceros viper
ribeyes
sacra fistula
scarped plain
schalen
self-tune
semidiurnal wave
session network services
slippiness
sof
stower
subatomic chemistry
superconducting power transmission
supraorbital canal
test for identification
the sponsor
thousand-yard stare
thugged out
thyroid heart
to row
totally normal orthogonal system
Udorskiy Rayon
unstable region
Vena pulmonalis sinistra inferior
volt-line
vorarephilia
wedge-shaped graben
wirewounds
workable underground mine reserves
Zêzere, R.