时间:2019-01-08 作者:英语课 分类:Scientific American(六)月


英语课

This is Scientific American's 60-Second Science. I'm Christopher Intagliata. Got a minute? 


Open your laptop in New York city, and chances are you'll find a Wi-Fi hotspot to surf on. Not so in tiny Lone 1 Pine California, wedged between Death Valley and the Sierra Nevada Mountains. Houses are spread out, not stacked, and Wi-Fi sure ain't a long distance champ. That's why a lot of cities are abandoning their ambitious plans for universal wireless 2 coverage 3, explains wireless consultant 4 Robert Morrow in a recent issue of Science. Morrow writes that Wi-Fi will probably stick around in offices, but he says a different wireless technology called WiMAX, developed about 4 years ago, could become the new standard for larger areas with scattered 5 users. WiMAX avoids airwave interference by operating in licensed 6 frequencies. And being licensed means WiMAX stations can pump up transmitting power, expanding their range to a kilometer or more, that's 20 times the range of a WiFi station. So an entire city could be covered by a score of WiMAX base stations. And if tons of users swamp a WiMAX station, it can redirect them to an uncrowded neighbor. So it looks like no matter how lost in the woods you get, you'll still be able to check your email.


Thanks for the minute for Scientific American's 60-Second Science. I am Christopher Intagliata.



adj.孤寂的,单独的;唯一的
  • A lone sea gull flew across the sky.一只孤独的海鸥在空中飞过。
  • She could see a lone figure on the deserted beach.她在空旷的海滩上能看到一个孤独的身影。
adj.无线的;n.无线电
  • There are a lot of wireless links in a radio.收音机里有许多无线电线路。
  • Wireless messages tell us that the ship was sinking.无线电报告知我们那艘船正在下沉。
n.报导,保险范围,保险额,范围,覆盖
  • There's little coverage of foreign news in the newspaper.报纸上几乎没有国外新闻报道。
  • This is an insurance policy with extensive coverage.这是一项承保范围广泛的保险。
n.顾问;会诊医师,专科医生
  • He is a consultant on law affairs to the mayor.他是市长的一个法律顾问。
  • Originally,Gar had agreed to come up as a consultant.原来,加尔只答应来充当我们的顾问。
adj.分散的,稀疏的;散步的;疏疏落落的
  • Gathering up his scattered papers,he pushed them into his case.他把散乱的文件收拾起来,塞进文件夹里。
adj.得到许可的v.许可,颁发执照(license的过去式和过去分词)
  • The new drug has not yet been licensed in the US. 这种新药尚未在美国获得许可。
  • Is that gun licensed? 那支枪有持枪执照吗?
标签: SSS ambitious
学英语单词
accommodating transaction
agalma black
all weather body
Amborellales
annulment of marriage
atrial premature contraction (apc)
balck gold(maldonite)
bilateral contract
bjorken-feynman scaling
busted
classification index
Columbia Glacier
conveyer volume meter
cook-off
data reuse
depletives
discount chains
Drum Driving
Earn, Loch
ebgs
ebullition chamber
echo amplitude
emipration theory
environmental quality requirement
fertilizer the soil
fetch off
foid-bearing
foot channels
gadlinium
garden for the blind
gas-liquid heat exchanger
geriatric epidemiology
Gordiacea
half-gas firing
hangoverless
heat discharge
hessian fire hose
hydrargyrum ammoniatum
hydrostome
inhibitor of apoptosis protein
keep on the right side of the law
kernel regression estimation
knotted sheepshank
lean best power mixture
lonchura punctulata topela
loop coupling
mail rocket
management workstation
mannosocellulose
marsaline
means of logistic command
mitraspecine
myxosarcomatous
nonfeminine
north-central
orbitesta
overneat
Pereskiopsis
Picea montigena
pidgin English
post doctorate
pressure-difference valve
pulse compression
quantify
quartz sinter
quasim
re-acquire
rear indicator light
reasonally
rhodium bisulfide
robot safety
robust controller
role-culture
roofing putty
sabatoes
sauba ants
simultaneous system of equations
solveig
space partition
square with the world
stever
stock-holding
swamp blueberry
t'u ?rh wu
tabatha
test radius
testiculose
tool-box-door latch
transformer relay
trouble proof
truncus corporis callosi
unit hydrograph
unlashes
urological pathology
vances
variable levy
viburnum formosanum hay.
well-characterized
William Ralph Inge
witness to the accident
woodfin
zivania