时间:2018-12-24 作者:英语课 分类:Scientific American(三)月


英语课

   This is Scientific American 60 second Science, I’m Sophie Bushwick. Got a minute?


  It was thought that saltwater seas separated Central and South America millions of years ago. But a recent discovery may render that idea all wet. Because archaeologists in Panama have dug up the remains 1 of ancient alligator 2 relatives—which were freshwater creatures. The work is in the Journal of Vertebrate Paleontology.
  Excavations 3 at the Panama Canal have turned up many fossils. Recently, two partial skulls 4 were found embedded 5 in rocks that date back more than 19 million years, which makes them the oldest crocodilian fossils ever found in Central America. The skulls are from two species of the freshwater reptiles 6 called caimans. Modern caimans are related to North American alligators 7 but live only in South America.
  To reach Panama, the caimans must have left South America around the beginning of the Miocene epoch 8, when ocean separated the two continents. These freshwater animals should only have been able to cross a short expanse of saltwater. So at the time, Central and South America may have been much closer than we thought. Either that, or those caimans hitched 9 a ride
  Thanks for the minute for Scientific American 60 second science, I’m Sophie Bushwick.

1 remains
n.剩余物,残留物;遗体,遗迹
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
2 alligator
n.短吻鳄(一种鳄鱼)
  • She wandered off to play with her toy alligator.她开始玩鳄鱼玩具。
  • Alligator skin is five times more costlier than leather.鳄鱼皮比通常的皮革要贵5倍。
3 excavations
n.挖掘( excavation的名词复数 );开凿;开凿的洞穴(或山路等);(发掘出来的)古迹
  • The excavations are open to the public. 发掘现场对公众开放。
  • This year's excavations may reveal ancient artifacts. 今年的挖掘可能会发现史前古器物。 来自辞典例句
4 skulls
颅骨( skull的名词复数 ); 脑袋; 脑子; 脑瓜
  • One of the women's skulls found exceeds in capacity that of the average man of today. 现已发现的女性颅骨中,其中有一个的脑容量超过了今天的普通男子。
  • We could make a whole plain white with skulls in the moonlight! 我们便能令月光下的平原变白,遍布白色的骷髅!
5 embedded
a.扎牢的
  • an operation to remove glass that was embedded in his leg 取出扎入他腿部玻璃的手术
  • He has embedded his name in the minds of millions of people. 他的名字铭刻在数百万人民心中。
6 reptiles
n.爬行动物,爬虫( reptile的名词复数 )
  • Snakes and crocodiles are both reptiles. 蛇和鳄鱼都是爬行动物。 来自《简明英汉词典》
  • Birds, reptiles and insects come from eggs. 鸟类、爬虫及昆虫是卵生的。 来自《现代汉英综合大词典》
7 alligators
n.短吻鳄( alligator的名词复数 )
  • Two alligators rest their snouts on the water's surface. 两只鳄鱼的大嘴栖息在水面上。 来自辞典例句
  • In the movement of logs by water the lumber industry was greatly helped by alligators. 木材工业过去在水上运输木料时所十分倚重的就是鳄鱼。 来自辞典例句
8 epoch
n.(新)时代;历元
  • The epoch of revolution creates great figures.革命时代造就伟大的人物。
  • We're at the end of the historical epoch,and at the dawn of another.我们正处在一个历史时代的末期,另一个历史时代的开端。
9 hitched
(免费)搭乘他人之车( hitch的过去式和过去分词 ); 搭便车; 攀上; 跃上
  • They hitched a ride in a truck. 他们搭乘了一辆路过的货车。
  • We hitched a ride in a truck yesterday. 我们昨天顺便搭乘了一辆卡车。
学英语单词
.inrs
acoustic perception
Aloe sinensis
anilinohydroquinones
anus urethralis
Aphiochaeta scalaris
apparatus for dam observation
archaeological photogrammetry
atomic weight scale
baldy pk.
basifixed
beswak
bi-directional triode thyristor
Blair, Anthony charles Lynton
bottai
Burtonize
C battery C-network
circuit situation report
contraclinal valleys
corpuscular eclipse
cost-of-living allowance
crpss
cupulometer
degausser
dilettantist
discontinuous flow
doppler free two photon spectroscopy
double octave (octaves)
Drake Cluster cotton
ectophosphodiesterases
entry field
family irenidaes
fixed course range
friction pile
gramscianism
Granite I.
holvi glasses
hotdog buns
housefall method
hypnum subimponens ulophyllum
I etc. shall not except you till I see you.
icteridaes
Ilerda
immetrical
JPO
keyboard data recorder
keytar
linear non-equilibrium thermodynamics
link man
lipsothrix pluto
Lohusuu
low-moor peat
luckiest
melting temperature range
metallic pickup
metavoltine(metavoltite)
mihirs
mikons
miogeoclinal association
mold line
moonishly
morning woody
N.T.C. (negative temperature coefficient)
nanobores
ornamental resolution
overswim
oxide/silicon interface
Passyng Sunday
Patterson Heights
pewter-grey
pine knots
Planet B
primary structurist
process air
propenyl hydrate
psychopharmaceutical
punto (panama)
Purnell
radiant resistance furnace
rail-riders
raised colony
relative deflection
residual gas analyzer
schizogenesis
scope note
sienna
single-particle
sm-mhc
St Ignatius Loyola
star region
sterk
synthesized hydrocarbon fluid
thumbnail preview image
tribune
trimle
trovoadas
ungrandiloquent
vallone
valve float
Warao
wet film thickness gauge
young river(stream)