n. 肺胞;蜂窝状小窝
n. Same as Alveolus.

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(323) / 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(330) / 评论(0) 分类 探索与发现2012年

Heroes (We Could Be) - Alesso Tove Lo We go hideaway in daylight 光天化日 我们隐藏自己 We go undercover when under sun 阳光下 我们暗地行动 Got a secret side in plain sight 众目睽睽 我们保守秘密 Where the streets are empty

发表于:2019-01-10 / 阅读(409) / 评论(0) 分类 2015最新精选英文歌曲

By David Gollust Washington 23 January 2006 Secretary of State Condoleezza Rice said Monday the prospect of a role in a Palestinian government for the militant Islamic group Hamas poses a practical pr

发表于:2019-01-11 / 阅读(357) / 评论(0) 分类 2006年VOA标准英语(一月)

Iran Tourism Appeals to 'Adventure Travelers' - Part 2 A recent British opinion poll found Iran near the top of the list of countries people would definitely not visit. Yet nearly three million international visitors traveled to Iran last year, and t

发表于:2019-01-14 / 阅读(294) / 评论(0) 分类 VOA标准英语2011年(八月)

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(363) / 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(374) / 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(372) / 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(332) / 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(376) / 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(342) / 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(320) / 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(364) / 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(412) / 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(357) / 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(365) / 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(382) / 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(336) / 评论(0) 分类 探索与发现2012年

By Anjana Pasricha New Delhi 17 January 2007 In Nepal, Maoist fighters have begun handing over weapons to be put under United Nations supervision. As Anjana Pasricha reports from New Delhi, the move comes two days after the former rebels joined the

发表于:2019-02-02 / 阅读(351) / 评论(0) 分类 2007年VOA标准英语(一月)

By Tom Rivers London 03 January 2007 The United Nations says it will investigate allegations that some peacekeepers in southern Sudan have been involved in the rape and sexual abuse of children. The abuse allegations were published Tuesday in Britai

发表于:2019-02-04 / 阅读(312) / 评论(0) 分类 2007年VOA标准英语(一月)
学英语单词
antiapopletic
aphoristic sentence
armoured cast iron
Arthon-en-Retz
articulation of elbow
auditory nucleus
average discharge
axle box bearing
basic four
behind the time
bhes
bidarkees
board panel
burning gases
cauchy-rieman condition
cellulose column
chal
chebeague island
continuing loan agreement
converse piezoelectricity
cool your jets
coral-root bittercress
corective equalization
craniocentric
cuprosulfate
cutaneous vesicostomy
dacryocystisis
debits
earth-friendly
echogatstroscope
ectodesm
elsinoe araliae yamamoto
eluxate
fonthill
front spring
Główczyce
Hague Agreement
Hammondia
Henggu
hoblies hole
hovelled
indirect matching of blood
inertia effect
injury from blunt utensil
kick of rudder
large gains
laser facility storage
link file
Makra, Nisis
mobile engine driven diaphragm pump
module patterns
most-favored nation
mudcloth
multiple effect thermocompression evaporation
mutilid
nancy-pretty
Natal Downs
Nernst's distribution law
nourritures
olivenite
original value of fixed assets
Orobanche sinensis
ossa digitorum pedis
other-observation
parillin
parity-checking code
parliamentary under-secretary
pettengill
precipitate recognition
proteantigen
protective equipotential bonding system
raise the bar
random access file
respacings
risic acid
salary and wage administration
schlanger
scyllo-inositol
self-cleaning rotating screen filter
silo test missile
single-generation household
spamblocked
spinback
starting position
stock segregated account
strontium phosphate
subsynchronous orbit
Sudheim
sulter
swacked
thwak
torpedo seaplane
typeattribute
u-s-d-a
Valhalla
wholesale merchants
wiranto
wrapped distribution
Xenalamine
Yabbenohr
zulkarnaen