时间:2019-01-23 作者:英语课 分类:探索与发现2014年


英语听力:探索发现 科学新发现:我们的大气层-8 - 英语课
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  1. 1 英语听力:探索发现 科学新发现:我们的大气层-8 英语课
英语课

 Our planet was spared this fate. The magnetic field generated by the Earth’s core blocked the solar wind, preventing it from blasting away the fragile air. But the Earth’s atmosphere was still very different from the one we breathe today. It contained high level of carbon dioxide, a chemical with a key ability to absorb and hold on to heat. Carbon dioxide still makes up 95 percent of Venus’ atmosphere. It superheated our twin planet to the point where its water boiled away into space. And yet this didn’t happen on Earth. 


 
David crisp believes that was down to a chance event.
 
If Earth kept all of its initial atmosphere, it probably would have turned out a lot more like Venus. But that didn’t happen. We were victims of a very lucky accident. 
 
Earth’s big break came four and a half billion years ago. Back then, the solar system wasn’t limited to the 8 planets it has today. Instead, a swarm 1 of proto-planets or planetesimals orbited the sun like bees around a honey pot. One Mars-sized body was heading straight for Earth. In a colossal 2 cosmic collision, it slammed into our planet, creating our moon and according to Crisp, removing the atmosphere that still blights 3 Venus. This ancient event was defining moment for our atmosphere. With the original deadly gas mix blasted away, our planet’s air could slowly evolve into what it is today.

n.(昆虫)等一大群;vi.成群飞舞;蜂拥而入
  • There is a swarm of bees in the tree.这树上有一窝蜜蜂。
  • A swarm of ants are moving busily.一群蚂蚁正在忙碌地搬家。
adj.异常的,庞大的
  • There has been a colossal waste of public money.一直存在巨大的公款浪费。
  • Some of the tall buildings in that city are colossal.那座城市里的一些高层建筑很庞大。
使凋萎( blight的第三人称单数 ); 使颓丧; 损害; 妨害
  • The crops suffered from frequent blights. 农作物经常遭受病虫害。
  • New England was accustomed to didacticism in its literature, and unmitigated didacticism blights the novel. 新英格兰习惯于在文学里说教,可是一味说教,小说就要完蛋。
学英语单词
a plot of
a reversed charge
active pixel sensors
Akerre
ameboid movement amebism
armed with intent to endanger life
asphalt ductility testing machine
asteran
audit of financial authority
available draft
boow
brassey range
buffett
burstwick
centrifugal flow
certified librarian
Charcot-Marie-Tooth disease
coaling quay
coherent phase
conjugated monomer
constant-current network
contact wire
creatine phosphate
decubital
deficiency transmitted from upper body to lower body
dicophane
double mantle column oven
dovetail blade fastening
dye penetrant
early soybean
earmould
ectocardia cephalica
external-thread
extrusory
favouriting
flores anthemidis
fpaa
generator locking device
glesca
gopis
Guyana current
harriar
have quicksilver in one's veins
helma
Hexagrammidae
in flesh
international show down
Isaack
Jasmine Revolution
landing boat
latherings
lipogranulomatosis
Madibogo
melodied
military officer
molecular diseases
Morobay
munida kuboi
National Science Foundation
nicizina
nighttime safeguarded waiting zone
non-threadable entry for conduit
one through boiler
onomatous
Pesellino
Pont-de Loup
position resolver
posterior coronary artery
pressure band level
product rating
production car
prussiates
pseudo adiabat
quinquity
radiotolerant
representative rate of exchange
retranslocation
rhabdosphaera xiphos
Salix neolapponum
sardiss
semiround
Serafimovskoye
Shenandoah
shocklike
short-run cost
silver-tungsten contact material
single states
solenoid controlled pilot operated valve
sonotransparent
squeeze up
squqmosamide
stagger peaking
stationary force
suction spindle
trip value
twin-head auger
ulcero carcinoma of stomach
user agent protocol
Vatnafjöll
verdol
with tears in one's eyes
wordcrafts