时间:2019-01-31 作者:英语课 分类:VOA常速英语2007年(十一月)


英语课
By Paul Sisco
Washington
14 November 2007
 


At the McDonald Observatory 1 in western Texas, a unique space program has been quietly underway for more than 30 years. It is called the Lunar Laser Ranging Program. VOA's Paul Sisco has more.


Research scientist Jerry Wiant has traveled a lonesome highway in western Texas to the McDonald Observatory in the Fort Davis Mountains almost every morning for 38 years.


Once there, Wiant powers up a high powered laser beam that travels to the moon and back several thousand times a day. "Light Amplification 2 by Stimulated 3 Emitted Radiation," he explains is how Laser gets its name.


It is all part of a study funded by the U.S. space agency, NASA.


The laser sends pulses of green light through a telescope, to four reflectors on the moon's surface. Wiant explains, "It hits the reflector that we are aiming at and then that reflector sends the light back."


Apollo 11 astronauts set up the first reflector when they made the first manned flight to the moon nearly 40 years ago. Subsequent Apollo mission's added two more reflectors, and an unmanned Russian mission sent a fourth.


"The fact that we can lunar range [target moon reflector with laser] at all is just short of a miracle," said Wiant


The lunar laser provides data on gravity, tides and spreading land masses here on Earth. It has also showed that the moon is moving away from Earth 3.8 centimeters annually 4.


NASA scientist Wendell Mendell says, "This information about the structure of the Earth and the structure of the moon is fundamental to our understanding of how planets work."


It is all in a day's work for Jerry Wiant, deep in the quiet hills of western Texas.




n.天文台,气象台,瞭望台,观测台
  • Guy's house was close to the observatory.盖伊的房子离天文台很近。
  • Officials from Greenwich Observatory have the clock checked twice a day.格林威治天文台的职员们每天对大钟检查两次。
n.扩大,发挥
  • The voice of despair may be weak and need amplification.绝望的呼声可能很微弱,需要扩大。
  • Some of them require further amplification.其中有些内容需进一步详细阐明。
a.刺激的
  • The exhibition has stimulated interest in her work. 展览增进了人们对她作品的兴趣。
  • The award has stimulated her into working still harder. 奖金促使她更加努力地工作。
adv.一年一次,每年
  • Many migratory birds visit this lake annually.许多候鸟每年到这个湖上作短期逗留。
  • They celebrate their wedding anniversary annually.他们每年庆祝一番结婚纪念日。
学英语单词
accounting by month
adduces
afp reblocking program
aginactin
Albanic
alexandrinuss
anderson-brinkman- morel state
antiodorant
apoglycogen
atretic
Avicennia marina
avocourts
azimuth and range
bast zone
biotherms
boat tiller
bunya pine
Bégon
calcifying epithelioma of malherbe
call by name parameter
cherry-sized
choleuria
commoditie
common substructure
construction finished
creditor's equity
Dashtobod
decollated
Dessie
dextrosum
dieng
dihydroepicandrosterone
eighty-two
Electroflour
embrute
exchange energy
fore-bay
formatted field definition
Fowles
geeken's diagram
geometric configuration
goggle eye
have trust in
heater steam coil
heimo
high power coastal station
horizontal evolution
hyperconcentrations
king of the forest
Lashkar-e-Taiba
leakseeker
liability accounts
liquid space velocity
Masāhūn, Kūh-e
meduseld
mode indication
movt
mysteries of a trade
named entry
non-zero spin
ocutome
ogalalas
opler
oversocializing
pc.1
perceptual proof
posthumanisms
precampaign
pressurewire
radii loss
regular ramification
Renver's funnel
Rheem Valley
ring twister
Sanquinarine
Sao Tome and Principe
scan control unit
Scheffau
second stage cooler
shent
simple branched alveolargland
single-core optical connector
sinusitis
soil horizontal distribution
superconducting power transmission
Swedeling
tantalum filament
tavares
tempon
titanias
Toltecan
total net weight
triisobutyltin bromide
twangster
two-station molding machine
universally valid formula
unsolomonize
upcraft
word cycle operation
Wǒnhung-ri
zinc caprylate