时间:2019-01-30 作者:英语课 分类:实用英语


英语课

   The amount of debris 1 orbiting the Earth has reached "a tipping point" for collisions, which would in turn generate more of the debris that threatens astronauts and satellites, according to a US study released on Thursday。


  NASA needs a new strategic plan for mitigating 2 the hazards posed by spent rocket bodies, discarded satellites
  and thousands of other pieces of junk flying around the planet at speeds of 17,500 miles (28,164 kilomtres) per hour, the National Research Council said in the study。
  The council is one of the private, nonprofit US national academies that provide expert advice on scientific problems。
  Orbital debris poses a threat to the approximately 1,000 operational commercial, military and civilian 3 satellites orbiting the Earth -- part of a global industry that generated $168 billion in revenues last year, Satellite Industry Association figures show。
  The world's first space smashup
  occurred in 2009 when a working Iridium communications satellite and a non-operational Russian satellite collided 490 miles (789 km) over Siberia, generating thousands of new pieces of orbital debris。
  The amount of orbital debris tracked by the US Space Surveillance Network jumped from 9,949 cataloged objects in December 2006 to 16,094 in July 2011, the National Research Council said。
  The surveillance network tracks objects approximately 10 centimeters in diameter and larger。
  Some computer models show the amount of orbital debris "has reached a tipping point, with enough currently in orbit to continually collide and create even more debris, raising the risk of spacecraft failures," the research council said in a statement released Thursday as part its 182-page report。
  "The current space environment is growing increasingly hazardous 4 to spacecraft and astronauts," Donald Kessler, the former head of NASA's Orbital Debris Program Office who chaired the study team, said in a statement。
  据美国上周四发布的一份报告,地球轨道上太空垃圾的数量已经达到“临界点”,有撞击风险,而后可能产生更多碎片,威胁宇航员和人造卫星的安全。
  美国全国研究委员会在报告中称,美国宇航局需要制定新的战略计划,以减小火箭残骸、报废卫星、以及数千块其它太空垃圾的危害。这些轨道太空垃圾时速高达1.75万英里(28164公里)。

n.瓦砾堆,废墟,碎片
  • After the bombing there was a lot of debris everywhere.轰炸之后到处瓦砾成堆。
  • Bacteria sticks to food debris in the teeth,causing decay.细菌附着在牙缝中的食物残渣上,导致蛀牙。
v.减轻,缓和( mitigate的现在分词 )
  • Are there any mitigating circumstances in this case ? 本案中是否有任何情况可以减轻被告的罪行? 来自辞典例句
  • A sentencing judge is required to consider any mitigating circumstances befor imposing the death penalty. 在处死刑之前,要求量刑法官必须考虑是否有任何减轻罪行之情节。 来自口语例句
adj.平民的,民用的,民众的
  • There is no reliable information about civilian casualties.关于平民的伤亡还没有确凿的信息。
  • He resigned his commission to take up a civilian job.他辞去军职而从事平民工作。
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。
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Abies dayuanensis
aboukir
acetylalisol
acoustic navigation system
acoustical insulation board
alkyl metal
all-against-all
anthracology
anti-deteriorant
betwist-mountain
Bilečko Jezero
biological oceanography
birth-control campaigners
bloodworks
boom mic
bucket blade
Cai Lay
casadei
cheapener
checkrows
Classic Triad
coated bulb
Copsychus
crohn's
cubed
Cutaneo
daisy chained priority mechanism
delivering information
electro-deposit copper
english-based
febris recurrens europaea
flux monitors
gallery kiln
Gaussian equation
genus Gavia
Glengarry Ra.
go to school to sb
hamart-
highest possible key value
irenina hydrangeae
isoetid
Kampinda
land use survey
lead splash condenser
limit register
Lionel Hampton
log-lin
low-lying placenta
mean volume diameter
membrane modulus
metalepses
methyl n-undecyl ketone
methymethacrylate
mid-parent
mist-detection instrument
msstic tests
multi-stage method of washing
natural exhaust
new jack swing
Noikohis
nozzle tube lever block
nun's cloth
offset bulb
oncurable
one-piece casting
open wire link
orthographers
overrulest
Passive portfolio
paste reactor
peak temperature
pervestigation
photorelay
physical distancemeter
pinus longaevas
porphyry shell
precision measurement
preconsign
premixed gas
pulls
ranajit
reference fringe
relieve sb of
Rhododendron megeratum
rivieras
rr. musculares (n. femoralis)
Salfit
saline diuretic
scintillation decay time
silver(II) oxide
soft toys
starvation of processes
steam trap (upright bucket type)
Stegi
Stromatoporoidea
thallations
transparent electrode
triggered response
universal electron microscope
war machines
Warmeriville
Wellerellacea