时间:2019-01-23 作者:英语课 分类:探索与发现2014年


英语课

 Approaching from beneath the planet, asteroid 1 2012 DA14 passed inside the orbit of our geostationary satellites before heading off to the north. This asteroid had been successfully tracked for a year. And despite its proximity 2, scientists knew that it posed a threat. So we know we are safe for at least 100 years from most near-Earth asteroids 3 over a kilometer in size. We are better at detecting objects down to 50 metres across like DA14. But for asteroids smaller than that, like the one which exploded over Chelyabinsk, we still have little or no warning. 


 
There are still some we haven’t found. So there’s this unknown bit of the equation where we are still looking for some. We know they are there but we don’t know where they are. So this is a threat, but hopefully as technology moves on, we’ll always have a much better idea where one’s going to pose a risk to the Earth. We could see an event tomorrow; we could see an event in 10 or 20 years time that we hadn’t previously 4 detected. That is always the risk we face. Until we can catalogue and identify all the hazardous 5 objects in the solar system, that risk will always remain.
 
And there’s one other factor that can make it particularly hard to spot an incoming object. It’s the reason why no one saw that asteroid that was hurtling towards Chelyabinsk.

n.小行星;海盘车(动物)
  • Astronomers have yet to witness an asteroid impact with another planet.天文学家还没有目击过小行星撞击其它行星。
  • It's very unlikely that an asteroid will crash into Earth but the danger exists.小行星撞地球的可能性很小,但这样的危险还是存在的。
n.接近,邻近
  • Marriages in proximity of blood are forbidden by the law.法律规定禁止近亲结婚。
  • Their house is in close proximity to ours.他们的房子很接近我们的。
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.以前,先前(地)
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
adj.(有)危险的,冒险的;碰运气的
  • These conditions are very hazardous for shipping.这些情况对航海非常不利。
  • Everybody said that it was a hazardous investment.大家都说那是一次危险的投资。
学英语单词
access manager
acquired immune deficiency syndromes
adiabatic curve
ailurophiles
amplified interpretation
Ant-Vireo
Antonia
atomic angular momentum
attachment flange
automatic bypass valve
babyishly
baitshops
Bembridae
bemeant
Blastocladiales
censor out
ciprofibrate
colour-serjeant
comb ... hair
concho-grass
crinkley
daemonophobia
Decaspermum esquirolii
Dryopteris fragrans
eaved
Europa, Pta.de
evaporator strip holder
farras
ferroprotoporphyrin
froth flotation
fuddling
full wave rectifier
genus Placuna
grease pits
half-height drive
have someone's guts for garters
Hawtrey, Mt.
holes in pattern
in-thing
indirect discrimination
indirect-arc furnace
istake measure
japao
katsuwonus pelamiss
keramite (mullite)
license plate
longbeards
lounge around
manual removal
marjayouns
meet sb halfway
methyl p-methyl benzoate
model following
mucopolysaccharide-N-acetylneuraminylhydrolase
none-kin
nonsonorous
odd moment
offskip
oil flinger
on my case
otelo
pancratic lens
Periyār R.
perpetuum mobile of the first kind
piledriver
pole jumps
product introduction
pronouncement of judgment
pulse-phase system
quarion
REA Rural Electrification Administration
recursive descent parser
scabricola ocellata
scheduling model
schlottmann
scurfy
sealing effect
secondary homonym
secondary metal
self-operated control valve
sociology departments
squeeze mouding machine
sridevi
standard hour system
statutory assignee
styrene-acrylonitrile copolymer
sufferances
taper thimble
thin-layer chromatogram
transmission-utilization ratio
trintignant
tubular(tracheal)sound
two-pence
underutilize
unheled
V and T
vapo(u)rizability
Vicia tenuifolia
wagon control computer
wire rope detector
year dot
zabras