英语听力:自然百科

By now the pronghorn have pushed further than any of Yellowstones animals, out of forests, through farmland and down into the wide prairies at the foot of the Rocky Mountains themselves. Their search for winter grazing takes them over a hundred miles

发表于:2019-01-22 / 阅读(64) / 评论(0) 分类 自然百科2012年

Now he must gather the last of his strength. The rival wants to take him on. The aim is to get an antler point into his neck. But they are evenly matched. Neither can penetrate the other's guard. Now, it's all about power. A well-aimed thrust or a br

发表于:2019-01-22 / 阅读(68) / 评论(0) 分类 自然百科2012年

Groves of aspen/ all turn at the same time, each grove descended from one tree interconnected by roots, color coordinated. As cold air sinks further down from the mountains, it brings autumn mist to Yellowstones valleys. It was in the autumn of 1870

发表于:2019-01-22 / 阅读(59) / 评论(0) 分类 自然百科2012年

In just a few weeks, this lake will be frozen, and the beavers wont be able to cut and move trees, but they will be able to swim right under the ice to feed from this underwater larder. Moose also eat twigs and branches and often try to take advantag

发表于:2019-01-22 / 阅读(58) / 评论(0) 分类 自然百科2012年

To stay is to face the certainty of snow and wolves. To go offers the chance of an easier life, but the uncertainty of the world beyond Yellowstone. Every autumn, thousands of elk do leave Yellowstone, and as they go, they cross an invisible line out

发表于:2019-01-22 / 阅读(56) / 评论(0) 分类 自然百科2012年

All over Yellowstone, male elk are challenging each other for dominance. The sound of Yellowstone's autumn. They're trying to win the admiration of females and gather them into a hareem, only then do they stand a chance of mating with them before win

发表于:2019-01-22 / 阅读(51) / 评论(0) 分类 自然百科2012年

It cuts branches into more manageable lengths and then swims them down a network of purpose-built canals towards the dam. The pond to give this beaver protection from predators, and the canals allow it to forage far into the forest, carrying many tim

发表于:2019-01-22 / 阅读(62) / 评论(0) 分类 自然百科2012年

They may be a little safer here. But the food in the forest is far less nutritious than on the riverbanks. If they want to eat well and avoid wolves this winter, they'll need to keep on moving. As the elk move gradually downwards, they follow the riv

发表于:2019-01-22 / 阅读(70) / 评论(0) 分类 自然百科2012年

Its now September, and the elk/ have made their way down to graze where the grass on the riverbank is still green, and they can browse the nutritious shoots of young willow trees. The males are now upping their game. This bull urinates on himself to

发表于:2019-01-22 / 阅读(48) / 评论(0) 分类 自然百科2012年

Up to 150 at a time, a fifth of its entire body weight. Then it flies as much as 15 miles away, and drills the nuts into the ground in sets of ten, placing a stone on top of the stash to mark the site. It goes back for more and more. Over the autumn,

发表于:2019-01-22 / 阅读(56) / 评论(0) 分类 自然百科2012年

But this is not much good for the tree. Its seeds have gone nowhere. A grizzly bear mother and cubs. It's unusual for a grizzly to have so many cubs. This mother has found two orphans, and adopted them. But now she has four cubs to fatten up before t

发表于:2019-01-22 / 阅读(52) / 评论(0) 分类 自然百科2012年

But as many are preparing to get out, some have no choice but to stay. In the remote northeast of the Yellowstone wilderness, are the Beartooth Mountains. Here, surviving about 8,000 feet, a tree now welcomes the change of / season, the white-bark pi

发表于:2019-01-22 / 阅读(61) / 评论(0) 分类 自然百科2012年

The sun has revitalized this place, and now there are more living things here than at any time of the year. The summer has brought visitors too who are enjoying Yellowstone at its most vibrant. As the sun now starts to get lower in the sky, the rich

发表于:2019-01-22 / 阅读(59) / 评论(0) 分类 自然百科2012年

Yellowstone, volcanic wonderland, two million acres of wild space, right in the heart of North America. The heat of the summer has unveiled the full extent of the Yellowstone wilderness, and for a few precious months it has blossomed. But now, Yellow

发表于:2019-01-22 / 阅读(58) / 评论(0) 分类 自然百科2012年

As she approaches to see him off again, she realizes she has been injured. A damaged jaw would be a disaster for her and her family. Clearly in pain, she leads the anxious cubs to high ground away from the male. She nurses to calm and / reassure them

发表于:2019-01-22 / 阅读(60) / 评论(0) 分类 自然百科2012年

But just as the first of Yellowstone's new generation are preparing to leave, its last visitors are arriving. Night after night, army cutworm moths have been escaping the heat of a distant prairie. They have been flying in on favorable winds, hiding

发表于:2019-01-22 / 阅读(63) / 评论(0) 分类 自然百科2012年

Bison calves are more independent of their mothers. The adults' focus is now set on a ruthless competition to mate. A male bids to enter a herd with females in season. He uses dust to accentuate all his size and power. Another male already establishe

发表于:2019-01-22 / 阅读(54) / 评论(0) 分类 自然百科2012年

As the thaw reaches up into the mountains, a part of Yellowstone that few ever see is briefly revealed. From its first day above the snow, this pika is obsessed by food. It's in a frantic race to restock its winter larder before the snow closes in ag

发表于:2019-01-22 / 阅读(65) / 评论(0) 分类 自然百科2012年

Bison lose the last of their winter coats. In the heat, tempers fray. To escape soaring ground temperatures, cowbirds choose a bison's back as a cool place to feed and catch the breeze. Biting insects now become a draining nuisance. A grizzly bear es

发表于:2019-01-22 / 阅读(51) / 评论(0) 分类 自然百科2012年

They are vast smoke plumes. Yellowstone is burning. Throughout the summer, the dry lodgepole pines have become like a tinderbox, and lightening has struck the match. The worst wild fires will burn for weeks. In 1988, a third of Yellowstone burnt in a

发表于:2019-01-22 / 阅读(73) / 评论(0) 分类 自然百科2012年
学英语单词
alternate proof
aminomethylphosphonic acid
anticrowd
aplonis panayensis
area of low pressure
avant canal
bakupari
Basutoland
bathing tubs
be cut to the bone
Bezhetsk
body part of a pig
Brolo
carbon heating element
cic (compensate ion chamber)
cisstimulation
coeruleofibrite
coordinating agency
dearomatises
demander
depolarizing cathode
devotionary
diacylamines
diaphragm type pressure sensor
divvies
double-current bridge duplex
drilling head
duplex, half
dwts
elastic hardness
enteroclysia
exponent sign
femto-farads
fine coupling
fixed brush
format select
Fourler-Stieltjes series
Geisa
gentiana algida pall var. sibiriva kusn.
genus toxostomas
Ginni
green ginger
hard disk array
head presentation
hertz effect
hilltop youth
hinokinin
hot line tool
icterus toxicus
improper installation
index range
know a little about
ladies-only
leading decision
log-normality
luner
magneto-optical media (mo media)
Maldon
manzamines
MEAP
mechanical projection system
meta-salts
molecular diamagnetism
monolithic boundary layer capacitor
moville
non-liquefying
nonpolitician
nonvulgar
normal demand curve
one-piece dress
pack it up
penstemon newberryis
phl
photographic image processing
planning run
planning variable
platform combine
power-rooms
Primary energy consumption
prime implicant table
rated-horsepower
reutilised
reversed martingale
roll over credit
round-point shovel
sea water ion-association model
serosorting
snowplough train
soil-sampling tube
soli-
spa-goers
span by span construction method
spot-welded
teaching idea
transvaluations
treos
usable width of lock chamber
waste filling
west turkistan
WiFi adapter
Yonashiro
zettaampere