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
a closing quotation
animal energetics
anti-rust composition
barkhausen-kurtz oscillator
bornstein
borrowing arrangement
capacitive coupled microwave plasma
car accident
Ceratophyllus silantiewi
Cheilostomata
Congress of Racial Equality
corotating interaction regions
dansband
data-driven dss
deblocking
deci-henry
delmore
democratism
denudation rate
dermatrophy
deviation intelligence
differential type
disculpations
door locking device
dosimeter charge
Duplessis-Mornay, Philippe
eastern white pine
economy of plenty
effeminate wool
equitable title
faccion
fathometers
file window
freeboard decks
future income
gloriam
headshrinkers
hematoxin
high speed machining
hybrid communication network
illuminists
image band
impregnative
incompatible elements
indent invoice
integer arithmetic
integrally forged cylinder
integrated layout
IRD
Issin
jet propelled
joslyn
kruses
levoversion
Linosite
mckeowns
mend (one's) fences
metallurgic product analysis
methylharmalol
micro-diskette
middling purifier
minimisings
mold-breaking
molecular resonance
net profit to sales ratio
Ocean Margin Drilling Program
Ofuasi
ohh-hh
Over Worton
overlayings
P.P.C.
pemetrexed
pichard
plutonium credit
point rodding
polyphase meter
pseudocercospora pseudehretiae
random mixing
rate of feathering
re-tools
residual system
RVer
Ryssopterys
science of Chinese materia medica
selenic fluoride
slees
slotted template
sper-
stand for nothing
suspended tray elevator
syndicated tender
tectono-
Thai architeture
thick
time study standard
trailer tyre
tummy
vally
virgin-
Weiselfuttersaft
year before last
yoruba dance (w. africa)