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
abroscelis anchoralis punctatissima
adhesive tractive force power
ambiguous point
aminoacetonitrile
amplitude distortions
anti-urbanisms
antibonding electron
antidiazotate
arc firing
artificial bitumen
Baturetno
baulage tractor
be on a razor's edge
billability
bleeding rate
Bodroghalom
Bol'shoy Arkadak
bronchial fremitus
centi-second
cleavings
clonuses
cloud-shrouded
collectings
collective transport
comins
coreomyces micronectae
cracking per pass
cretis
crude wood-spirit
dalmolin
daycares
deep web shearer
die sinking press
dillusion
drypis
ECMT
empty backhaul
girlism
gladder
Grammaticus
grohes
hair wax
housecraft
identity operator
imvic
in a position to
incontributive
integrated data management system
investigation of agricultural output
joyces
lapook
lecimibide
Magnolia figo
main-boom
maintenance dredging
man-machine function allocation
mark to the market
misdirective
MKP-X
mycorrhizals
myoviruses
otono
over-recruit
overall auditor's opinion
p140exo2
Paracoagulation
Peetri
point light type
post-sternal
projecting portion
pseudoexon
pulse repetition period jitter
Rabāt-e Kamah
real-time clock word
relapse into silence
repulsor beam
retrograde reservoir
rhododendron yunnanense franch
ripen up
Sagu-ri
saima
Serravallian Stage
set of teeth
slice structure
small-pox eruption
smokebomb
snottier
ST_size-and-quantity_something-anything-nothing-and-everything
stokely
subtree enumeration
three high plate mill
transistor structure
undiluted stock
unformatted media
unrewarding
venae cordis
vertical bar (branchial backet)
visual cloud pictures
wax-chandler
work drive motor
yongning
yuarwed