固体推进剂火箭

CRA-JAH! CRA-AWK-NEF,! Teddy croaked. Teddy was speaking Raven now, but Jack understood him perfectly. Teddyhad said, So+qV, Jackand Annie! Annie stepped forward. Sh, fluttered to the windowledge and perched with Teddy. GRA-QUORK! shecroaked. That's

发表于:2018-12-10 / 阅读(54) / 评论(0) 分类 汪培珽儿童英文分级书单《神奇树屋》

By Scott Stearns Dakar 21 October 2009 Women in Mali are encouraging more men to use condoms to slow the spread of the virus that causes AIDS. The prevalence of HIV/AIDS in Mali is low for West Africa, effecting less than two percent of the adult po

发表于:2019-01-14 / 阅读(43) / 评论(0) 分类 VOA标准英语2009年(十月)

By Zulima Palacio Washington 22 April 2008 Deep into the mountain state of West Virginia, a group of volunteers is determined to restore nature the way it was a century ago, before mining, logging and fires changed the landscape. To do so, thousands

发表于:2019-01-25 / 阅读(46) / 评论(0) 分类 VOA常速英语2008年(四月)

The land-speed record 地面速度记录 How to build a 1,000mph car 怎样建造时速1000英里的汽车 Hybrid rocketry will be used to drive faster than ever before 混合火箭技术将用于更快地驱动车辆 May 5th 2011 | from the print ed

发表于:2019-01-26 / 阅读(47) / 评论(0) 分类 经济学人综合

Spraying Insecticide Indoors Reduces Spread of Malaria Researchers in West Africa have shown that spraying insecticide indoors can dramatically reduce malaria transmission. Efforts to develop a malaria vaccine have so far been disappointing, so progr

发表于:2019-02-12 / 阅读(93) / 评论(0) 分类 VOA标准英语2011年(十月)

The first rockets were Chinese. In the 1230s the armies of the Song dynasty, 首批火箭出现在中国。十三世纪三十年代,宋朝军队 who were fighting Mongol invaders, started launching fire arrows propelled by gunpowder some 300 metres

发表于:2019-02-16 / 阅读(50) / 评论(0) 分类 经济学人科技系列
学英语单词
5'nucleotidase
a coffee mill
allowable cut
ammonium phosphate-nitrate
atlatls
beer hands
bidirectional prediction
borrowing powers
Buada Dist.
butropine
capacitor type smoke detector
characteristic of pressure tendency
chewing insect
cobrar
cone pulley system
consumer study
contact-cup anemometer
Dammfleth
die seat
diploite
direct-current excited-field generator
dorrclone
dual carburetor
ex-works
failure of good behavior
financial responsibility
full field speed
galactosomiasis
gantlopes
gephart
good-mother
hatchecks
heartbreakers
Heidegger, Martin
helville (andoany)
high velocity aircraft rocket
human remains pouch
ice-paper
Ikaria, Nisos
induced upwash
industrial policy
input alphabet
isopiptesis
kaggwa
larval seizures
left hemispheres
loculed
looping trough
low threshold of occupancy
lucas reagent
Luteinique
master-and-disciple
medical gaze
merolidine
methoxybenzoxazolone
mimmer
mite infestation
mymo
neo-hippies
non-self-sustained wheel suspension
nonmessenger
nuclear bohr magneton
nuclear core isomerism
omega windfinding
omega-3 fatty acids
omniantenna
packaging code number
parallel plate capacitor
paratroops
posthydrolysis
pranging
psychobiographers
Puffinus puffinus
ratchet nut
ratio scaling
red tops
rickburner
right hyperbola
Romanian alphabet
safety extra-low voltage (selv) ? equivalent controlgear
selendesy
settling in
shipping note
sine step
small-and-medium-size enterprises
split vertical camera
spur royal
straight collet
stuntwoman
supercharging in series-parallel system
teaching aid
trench feet
trim fore-and-aft
underground weigher
undernimmer
vibration testing machine
Vleminckx
war-dial
Wheaton Aston
Wilson-Mikity
with regard to
woodwork construction