时间:2019-02-24 作者:英语课 分类:英语听力文摘 English Digest


英语课

  Don: Hey, Yael, Have you heard? We've discovered two new oceans?

Yael: Where?

D: On Mars. Well, they aren't there any longer, but they were there a few billion years ago.

Y: I thought scientists weren't sure if Mars had oceans or not.

D: They weren't. The Mars Opportunity Rover found sulfates and other salts in the soil that were left behind when standing 1 water evaporated. It also discovered cross-bedding in the soil which was created by water ripples 2, and tiny mineral deposits  called blueberries that only appear if water is present. The northern lowlands of Mars looked like there might have been an ocean there, but there wasn't definite proof.

Y: So, what has changed their minds?

D: Gamma Ray evidence.

Y: That sounds exciting.

D: It is. The Mars Odyssey 3 spacecraft had a gamma-ray spectrometer onboard that  could detect elements buried as much as a third of a meter, or thirteen inches, below  the soil. Scientists used the spectrometer to measure the amount of potassium, thorium, and iron above and below what they thought to be the shoreline of ancient   oceans. They expected to see low concentrations above the shoreline and larger concentrations below. That would indicate that the elements had been leached 4 out of the soil by the water.

Y: So, what did they find?

D: They found the shorelines of a younger ocean about ten times the size of the Mediterranean 5 Sea, and an older ocean twice that size.

Y: It's too bad those oceans still aren't there.

D: Yeah. It sure would be a great spot for a cruise.



n.持续,地位;adj.永久的,不动的,直立的,不流动的
  • After the earthquake only a few houses were left standing.地震过后只有几幢房屋还立着。
  • They're standing out against any change in the law.他们坚决反对对法律做任何修改。
逐渐扩散的感觉( ripple的名词复数 )
  • The moon danced on the ripples. 月亮在涟漪上舞动。
  • The sea leaves ripples on the sand. 海水在沙滩上留下了波痕。
n.长途冒险旅行;一连串的冒险
  • The march to Travnik was the final stretch of a 16-hour odyssey.去特拉夫尼克的这段路是长达16小时艰险旅行的最后一程。
  • His odyssey of passion, friendship,love,and revenge was now finished.他的热情、友谊、爱情和复仇的漫长历程,到此结束了。
v.(将化学品、矿物质等)过滤( leach的过去式和过去分词 );(液体)过滤,滤去
  • They believe that the humic materials are leached from decaying plant materials. 他们认为腐植物料是从腐烂的植物体浸沥而来。 来自辞典例句
  • The concept holds that uranium is leached by groundwater from tuffeceous rocks. 该理论认为,来自凝灰岩的地下水淋蚀铀。 来自辞典例句
adj.地中海的;地中海沿岸的
  • The houses are Mediterranean in character.这些房子都属地中海风格。
  • Gibraltar is the key to the Mediterranean.直布罗陀是地中海的要冲。
学英语单词
affective and conative processes
air intercept missile
aluminothermic weld(ing)
antiminority
applicable standard
aspidosamine
b-nt1(broadband network termination 1)
Baikalian orogeny
basari
base course material
bespitting
bi-erasure
bigaroons
bindaas
blaner
blast line
bobby pin
buffer assignment
capillifolia
cavia porcelluss
checkpoint restart
cougarlike
crow quill pen
cuprargyrite
cyst of salivary gland
czepiel
dation
dilatory pleas
dodecaoxide
dray chain conveyor
Dubai-esque
earth-return system
ecological equivalence
eczema sclerosum
EHD generator
ekstrom
epidote-gneiss
expressly agreed terms of the contract
fattened
FDT
feetfoot
final payment
Fort Bragg fever
frame method
gaseous ammonia
high pressure side
Hilum renale
horny crunb
hydraulic breakwater
Ibe wind
impetiginous
infra-
inner plate
intersite transmission
junction luminescent device
kazooing
khasiensis
lecanactis submorosa
masked dance of bangolo (ivory coast)
matatanilactone
material labor
Mbabane
Montaigne, Michel Eyquem de
neo-theory of population
neutrons from fission
non alkali glass
normal electrode potential
nototodarus hawaiiensis
numerically controlled shears
pfeffers
plated bar
Pollution of Ship's Noise
post-temporal
Prut
pulsating oxidative pyrolysis
pumping and drainage plan
ratchet winding wheel
regular annual continuous survey
restraint welding
ruddy turnstones
sage honey
scatter proofs
Scorpiothyrsus erythrotrichus
screw tool
semidiagrammatic
share-croppings
Siemens' syndrome
Silver liqueur
spherical union
starter formula
stationary counter
street-ward
super injunction
temperature run
tetrapterum
thiocarbonyls
trailer tape
universal amplifier
vv. thoracic? longitudinales
Wagner's corpuscles
wishbone trysail
woad