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


英语课

The Time Before Fire

 


What is fire anyway?



Well, fire is rapid oxidization. It’s the energy released when oxygen atoms start combining with carbon and hydrogen atoms.



Exactly, so without oxygen in the air, nothing burns.



You mean there was a time before oxygen?



Yes. By roughly a billion years ago, simple forms of plant life called “eukaryotes” were already busily converting carbon dioxide into oxygen gas, just like their descendants do today. But before this process had been in place for a while, there wasn’t enough oxygen in the air for things to burn.



In fact, of all the planets, moons, asteroids 1, and comets in our solar system, the only place where you can actually start a fire is right here on earth. And even here, it’s only been possible relatively 2 recently.







火究竟是什么?


火,即燃烧,是快速的氧化反应。氧化反应是氧原子和碳原子或氢原子结合释放能量。



没错,那么如果空气中没有氧气,就不会有燃烧。



你是说氧气还不存在的那个时代?



对,大约十亿年前,和眼下的植物一样,地球上最原始的植物祖先“真核细胞”忙碌地将二氧化碳转变成氧气。但是,在此转化之前的一段时间,空气中没有足够的氧气可以燃烧东西。



而事实上,整个太阳系的所有的行星、月球、小行星、彗星,你会发现唯一可以生活的地方只有地球。而就算是地球,也是不久以前才可行。


eukaryotes:真核细胞


convert:转化




 



n.小行星( asteroid的名词复数 );海盘车,海星
  • Asteroids,also known as "minor planets",are numerous in the outer space. 小行星,亦称为“小型行星”,在外太空中不计其数。
  • Most stars probably have their quota of planets, meteorids, comets, and asteroids. 多数恒星也许还拥有若干行星、流星、彗星和小行星。
adv.比较...地,相对地
  • The rabbit is a relatively recent introduction in Australia.兔子是相对较新引入澳大利亚的物种。
  • The operation was relatively painless.手术相对来说不痛。
学英语单词
a sight less
acaridans
acoustomotive
adjustable double vascular clamps
air-compressor
anti classical
anti-jewish
aquastat
automatic flare out altimeter
ballast-tamping machine
battlewaggon
be a cup too low
blow the roof in on
blowing respiration
boom receptacle
Bourn
chicken-turtle
churn-owl
coagulometers
coated magnetic tape
compose sequence
conjunctival callosity
contribution fee
coordinating audit work
cross planking
cytogenetically
Dawasir
defameth
Dexambutol
do while statement
dogu
domestic animals
domify
Down-timber
dual-polarization oscillation
economic aspects
Evolved Packet Core
family Phasianidae
flood inundation period
fluid catalytic cracking (fcc)
forest insurance
Franklin Institute
furacana
globe buoy
goal trade-off
grammarize
hair follicle
heat release in reactor
helical plough
hydraulic roller mill
hydrocyanic acid
intercortical
l layer
L-shaped kidney
lead and zinc deposit
lecithinase
lneas
log burners
Lolland
long-winded
made in taiwan
mercapto
metacarpal bone
minnied
moved around
mud rock flow
multiple restart
neglect of economic performance
nondestructive ADD instruction
nonlinear functions
objectal
painting work
patrol box
Paul Bunyan
periotic cartilage
preparate
privileged instruction execution
processes of monition
puerperal sepsis
purpureas
regenerative reheater
Rehnquist, William Hubbs
repeated impact
replication form
retrace your steps
saretta
sargon ii
single-break
sinking funding
skip-tooth saw
smeiconductor ion-exchanged glass components
smog horizon
soft tank
split phase
standardization of accounting
the U.K.
Tikopia
to overlay
toileting
tumble drying
Velpean's hernia
worm-eat