时间:2019-01-26 作者:英语课 分类:英语听力文摘 English Digest


英语课

   类缘何而来?猩猩?还是猿?要追溯到更远的话,应该是单细胞生物吧!


 
  纳尼!还不对?
 
  那究竟是什么呢?
 
  今天的节目将为您讲述生命的起源……
 
  Life Traces in Lava 1
 
  Don: Can I ask you something, Ya?l?
 
  Ya?l: Sure!
 
  D: Do you ever stop to think about how all living things are ultimately related?
 
  Y: Eh…Yeah, sure.
 
  D: Bu...but I'm serious. Doesn’t it amaze you to realize that we can trace life back millions and millions of years ago to single-celled organisms floating around in the ocean?
 
  Y: Millions? Actually, it's billions and billions.
 
  D: Billions?
 
  Y: Yes, billion! Scientists have discovered lava rock taken from the ocean floor that contains remnants of life that are billions of years old. Three point five billion years, to be precise.
 
  D: What do they find, fossils?
 
  Y: Sort of. At certain spots the ocean floor oozeslava, which cools and forms rock formations. Microorganisms set up shop on the surface of these rocks and thrive on their rich chemical content. The microbes leave traces of their presence in the rocks in the form of tiny tubes.
 
  When researchers looked at three billion plus year old rocks and saw these kinds of tubes, they suspected that microbes once inhabited them. The most convincing piece of evidence was a type of carbon found in the tubes that’s produced by living things. So far, this is one of the oldest traces of life ever found.
 
  熔岩中的生命足迹
 
  Don: Y 我能问你一个事情吗?
 
  Ya?l: 当然!
 
  D: 你有没有停下来想过人类最初是怎么来的呢?
 
  Y: 额…当然啦!
 
  D: 我认真的!当你意识到人类的起源可以追溯到数百万年前漂浮在海洋里的单细胞生物时,难道你一点也不惊叹于造物的神奇?
 
  Y: 数百万?实际上,应该是“数十亿”吧!
 
  D: 十亿?
 
  Y: 恩,十亿。科学家在海洋底部发现了含有数十亿年前的生物残余的熔岩。准确的说,是35亿年前。
 
  D: 他们发现的是什么?化石?
 
  Y: 好像是。海底的某些地方会渗出岩浆,冷却过后便形成了岩石。微生物便在这些岩石表面“安营扎寨”,靠着岩石中丰富的化学成分生长繁衍。这些微生物在岩石中呈微型管状,留下了他们存在的“足迹”。
 
  当研究人员对这些经历了30多亿年“磨炼”的岩石进行研究时,发现了这些微型的小管,便设想微生物曾经栖居于这些岩石之上。最有力的证据是科学家在这些管状物中发现了一种碳,而这种碳物质仅由生物产生。这是迄今为止发现的最早的生命的“足迹”。

n.熔岩,火山岩
  • The lava flowed down the sides of the volcano.熔岩沿火山坡面涌流而下。
  • His anger spilled out like lava.他的愤怒像火山爆发似的迸发出来。
学英语单词
-monster
abons
acceptance of materials procedure
actinogestin
anion-permeable membrance
Arthurian
auzei
bacillus anthraces
basney
bear garden
berberest
bossage without bevel
buss
cam for starting control valve
Citibank,N.A.
couble crossover
di(sa)ssimilation
dielectric smoking
diffraction efficiency
Discordianism
dscc
dynamic storage allocation
efficient blending
endocrinal
Epstein's pearls
Erasis
extra heavy spring
femat
ferrugo
Galatella regelii
General George Custer
gobiernoes
hay-scented ferns
haygood
heavy outrage
herb-man
hybrid waveguide junction
hypoleydigism
in someone's line of country
insects and other pests in tobacco seedbeds
italian pen. (apennine pen.)
JTP
kairine
lavvies
Leoncavallo, Ruggiero
level tendering
lightboxes
lightning protecter
logical i/o function
m (mean)
mamcozeb
Martina Franca
masaji
mecodium wrightii copel.
moment due to vortices
morganstern
motivators
multiple rates system of exchange control
neo-hombreol M
non-polarized antenna
Oligotrichida
ophidiophilia
orfordness
overlond factor
oxide confinement
parmer
partition of element
pauly d
pediculid
poison camass
potassium dicyanoaurate
professional judiciary
Pseudo-ophitic
radar data transmission system
retenant
Sankt Joachimsthal
searching ephemeris
secular religion
ship axe
simple decision rule
solid boring bar
sommet
South Foreland
sperical variance function
Staunton on Wye
stockcars
stolone
swalewe
symplastic state
tetragonal pyramidal class
thrillant
titular possession
trailing-edge tab
tri-soap
trieterical
Turtle Creek
unevenness of application
unified thread
unsighted
water releasing culvert and pipe
zpes