时间:2018-12-02 作者:英语课 分类:CNN美国有线新闻2017年1月


英语课

  17 Television Day: Computers

  TV Commentary:

  ... the astronauts are returning to earth at exactly 5.24. Splash-down will be in the Pacific, 427 miles west of Hawaii."

  You have often heard announcements like this on television. Scientists can tell us exactly when a space-capsule will arrive on the moon, for instance, and exactly when it will return. They can calculate things like this to the nearest second. How do they do it? Well of course, they use mathematics. We can all do simple sums on paper, but we must use computers for extremely difficult calculations. Perhaps you have seen mechanical calculating-machines in banks and offices. They can work very quickly but nothing like computers. Computers aren't mechanical. They don't have wheels and gears in them. Instead, they work on electrical circuits and can do difficult calculations at tremendous speed. They can work 100 million times faster then the human mind!



学英语单词
acetphenetidide
Ajuga campylanthoides
Aromadendron
auxiliary boat
aversities
Bacterium ceylonense
ban-the-bombers
beginning of autumn?
belen
biopark
bonding
brassidates
breathing intensity
Buddinge
cahills
Canadian International Development Agency
carpenter moth
cathodic corrosion
Cervus elaphus
chord member of truss
closed frame
complementary transistors
core switch circuit
crown bar foot
derosier
desorption of pesticide
diallelic (atwood 1944)
distance bound
dominicide
egg-cups
equal angle bar
equal diffusion theory
extra-storm surge emergency warning
fast-cut
gastro-omental
gibbs helmholtz equations
goldeyes
GPRS mobility management
headpool
hurriyet
industrial circulating fund
intersymbol error
involucrum alarum
jettison system
kaolin(e)
key stroke verification
labor process
lateral excursion
lhasas
long term prediction
lyric theater
Mandioli, Pulau
manusculpt
Martinborough
materialled
Mazarete
medium heritability
meltableness
non-ionic catalysis
nonenrolled
notochordoma
number to position to voltage converter
nustles
oil heating unit
oligoclonicity
overcrowded
oxygeniferous
paper feeds
paraffinic hydrocarbon
pedroncelli
Pelletier, Pierre Joseph
Ping River
postiling
potential difference of total field
primary jaw crusher
radial deflecting electrode
rechargeability
rigid disc
rudder angle receiver
Rushden
scroll sheet
seismic earth pressure
self invention
SMNV
solenocytes
spindle shield
splitting strength
steam-operated impact hammer
sterilities
supporting stand size
swealed ingot
Sæból
tarpit
theriodonts
total correlation coefficient
TTVM
turn off thyristor
twunt
Unified Threat Management
vacuum-tube oscillator
valid signature
variable frequency speed control