[化] 环烯烃

发表于:2018-12-02 / 阅读(212) / 评论(0) 分类 英语口语1+1

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(134) / 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(137) / 评论(0) 分类 探索与发现2012年

Cloze: Stingers of the Sea 海中刺客 ── 水母 Given impressive-sounding names like Portuguese man-of-war, jellyfish are certainly respected and feared by humans. Not exactly a fish, and lacking a spine, this creature has a single body cavity

发表于:2019-01-02 / 阅读(160) / 评论(0) 分类 双语有声阅读

By Jim Teeple Ramallah 23 January 2006 Politicians in the Palestinian territories wrapped up final day of campaigning Monday, ahead of crucial vote Wednesday to elect new legislature Politicians in th

发表于:2019-01-13 / 阅读(246) / 评论(0) 分类 2006年VOA标准英语(一月)

Oum Sok began working as a cyclo driver when he was 18. He says the city has become very expensive over the years, making it much harder to earn a living. New York has its yellow cab. London has its red bus. But Phnom Penh has its cyclo - a three-whe

发表于:2019-01-13 / 阅读(200) / 评论(0) 分类 VOA标准英语2010年(六)月

The State Department said Thursday an agreement for the start of direct peace talks between Israel and the Palestinians is close to completion. The deal will apparently be sealed by statements from the United States and the International Middle East

发表于:2019-01-13 / 阅读(149) / 评论(0) 分类 VOA标准英语2010年(八)月

A: Sorry to bother you, but I was wondering if you could drive me to the emergency room. B: Of course. What is the problem? A: I am running a really high fever of 105 degrees, and I have a rash on my stomach. B: If you can, go and unlock the back doo

发表于:2019-01-15 / 阅读(140) / 评论(0) 分类 英语情景对话-健康

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(157) / 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(156) / 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(139) / 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(135) / 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(155) / 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(142) / 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(130) / 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(150) / 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(167) / 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(144) / 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(148) / 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(160) / 评论(0) 分类 探索与发现2012年
学英语单词
abcillus
absorption trap
accessibility of target
aleurolobus setigerus
alluvial clay
alternative control
analysis method of economic safety coefficients
auto-ballast mercuric lamp
autoproteolysis
basidorsalia
be on guard
box type plate
brief psychotherapy
cadmoindite
Cambridge critics
camogie
Cetti's warblers
color cinematography
conus flavidus
cotemporaneous
dentin wall
diagnosis method of foliar color
do best to
draw cut
eccentric motion reversing gear
effectivenss
email readers
engine room logbook
Epuivalent
equity instruments
exo
expectedness
favia speciosa
fenis
fullycharged
fuzzy preference
genus castillejas
genus pseudaletias
growlers
Hakata-wan
hedge mazes
horseherder
hypomegetic
ice wines
interactive program design
JB818
jet-pipe thermometer
Kιzιlcahamam
laser jaw recorder
linear comparator
magnetic field weakening ratio
maleson
manned balloon
medical hybrids
memberane
minka
mocamp
nose-art
notarises
nuisance abatement
olympic game
on-line searching
Osani
overemphasising
ovibovine
Pan American Games
parathyrotropic
persistent gas
piracy (of rivers)
pround flesh
psychomachy
put in for sth
quality grade
rank-ordering
region calcanea
riskfulness
sample rate
self-hold circuit
semiasphaltic oil
shootin' hoops
simulated weightlessness conditions
sitzmark
snow cradling
solemen mass
south southeast (sse)
start-up ramp
steam supply
strictly better
sulfogen black
swordsmanship
take the sun
tape-programmed multi-spindle machine
thanks offering
thread mills
transaction flow language
triviums
unrolling of container
viewler
watertight compartment
weight report
wormeries
xanthorhamnine