时间:2018-12-07 作者:英语课 分类:火星生命


英语课

These discoveries raised the stakes. Here was a planet similar to our own. Mars might not have cities or civilizations. But it could be home to other smaller life forms like microbes.

Chris McKay is NASA's leading microbe expert. He believes that finding even these minute organisms would be of the utmost importance.

If we find life on Mars, what we're almost certainly gonna find are microbes, little tiny microscopic 1 organisms. You think, well, what's the big deal? Well in fact for most of Earth's history, all the life was on Earth was microbes. And so going to Mars and even finding the smallest, dumbest, littlest bug 2 will still be important because it'll tell us that here in our own back yard life started twice. And so the hard part is possible. The evolution into intelligence and, and humanlike beings is pretty straightforward 3 compared to the question of could it get started.

And there is something about microbes that makes them well suited to surviving on Mars. They're incredibly tough.

They are the organisms also that live in the extremes. They can live in the very high temperature and very high acid and very high salt. They define the limits of life and the potential of life.

But hunting for microbes would not be easy. Mars is 6,700 kilometers wide and it has the same landmass as Earth. Microbes, on the other hand, are tiny. You could fit nearly 10 million on just your fingertip. It would be far harder than finding a needle in a haystack. Scientists had to narrow down their search. So they looked for the one thing that had to be present for life to form: a place where you could find microbes.

The search for life is the search for liquid water. Life on Earth is basically full of water. Life forms are basically little bags of water with little a, a few other ingredients added. But water is the main component 4. Water is what makes it work.

On Earth, all life is based on water. It's the main constituent 5 of every cell. Because water is basically inert 6, it's the perfect medium for different types of molecule 7 to flow around, meet and react together. It enables life to form.

microbe: a minute life form; a microorganism, especially a bacterium that causes disease

landmass: a large unbroken area of land

needle in a haystack: an item that is very hard or impossible to locate




1 microscopic
adj.微小的,细微的,极小的,显微的
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
2 bug
n.虫子;故障;窃听器;vt.纠缠;装窃听器
  • There is a bug in the system.系统出了故障。
  • The bird caught a bug on the fly.那鸟在飞行中捉住了一只昆虫。
3 straightforward
adj.正直的,坦率的;易懂的,简单的
  • A straightforward talk is better than a flowery speech.巧言不如直说。
  • I must insist on your giving me a straightforward answer.我一定要你给我一个直截了当的回答。
4 component
n.组成部分,成分,元件;adj.组成的,合成的
  • Each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
  • Blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。
5 constituent
n.选民;成分,组分;adj.组成的,构成的
  • Sugar is the main constituent of candy.食糖是糖果的主要成分。
  • Fibre is a natural constituent of a healthy diet.纤维是健康饮食的天然组成部分。
6 inert
adj.无活动能力的,惰性的;迟钝的
  • Inert gas studies are providing valuable information about other planets,too.对惰性气体的研究,也提供了有关其它行星的有价值的资料。
  • Elemental nitrogen is a very unreactive and inert material.元素氮是一个十分不活跃的惰性物质。
7 molecule
n.分子,克分子
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
学英语单词
absorption cross section
Acipenser schrencki
and the like
antibouncer
archaeological
Arif, Abdul Rahman Mohammed
back date
Balaing
binarite (marcasite)
Bona fide buyer
boxed processor
branch statistics
brendle
bronchial glands
brunost
call lamp
chemical anthropology
closes up
contract microbrew
court of equity
decibel (db)
direct firing system
direct-current telegraphy
drag anchor
duple ratio
electrodynamic vibration machine
ellesmerian
empirical school of management
eneida
energy-conscious
eustyles
excise duties
extraction gravimetric method
freedom of commerce
gasp in admiration
gbp
green parties
head tenon
heat quality
hemimellitic acid
indium hydrogen sulfide
Jackson's epilepsy
La Ferté-Vidame
language lab
lemon-juice
light show
liquid phase extraction
little monkey
magnetic bubble memory (mbm)
maneuvering propeller
maritimes
mauritane
monostyla closterocerca
morainal apron
n-hexylaldehyde
nascent protein
non-functional compound
NOT STRICT
nudas
optimum turn
other optical fiber measurement equipment
overflow attribute
oxalacetic ester
permissible lamp
photobeat
planeness of flange
planting system
plateau gravel
pneumatic liquid density gage
Poupart's line
praam
primary processes
production
pulse build-up time
quiero
railway bureau
regulator cover gasket
reversal nozzle
reverse swing door
ronghage
room temperature control system
safety goals
sand handling
scab union
seal pouring
self-scheduled algorithm
semiconductor barium titanate
serially linked reservoir
Shijǒng
silage combine harvester
single-bed room
sorbitan monolaurate
spade bolt
spark plug tester
sphygmophones
staiver
Tibenzatum
trivialities
ungreases
venit et defendit
ventrolateral compartment
Virus software