音标:[ˌekstrəɡəˈlæktik ˈnebjələ] ;
河外星云; 河外星系
词型变化:名词复数形式 : extragalactic nebulas
【近义词】

This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. If youve ever wondered where the Earth came from, the answer, it seems, is blowin in the windthe solar wind. Or so say scientists who, after examining sola

发表于:2019-01-08 / 阅读(59) / 评论(0) 分类 Scientific American(七)月

反射星云是靠反射附近恒星的光线而发光的,呈蓝色。反射星云的光度较暗弱,较容易观测到的例子是围绕着金牛座M45七姊妹星团的反射星云,在透明度高及无月的晚上,利用望远镜便可看到

发表于:2019-01-08 / 阅读(175) / 评论(0) 分类 托福英语

The Aeneid by Virgil 《埃涅阿斯纪》维吉尔 Mark first read the Aeneid while he was studying Latin in high school, and he recountedthe story of Aeneass quest and his desire to build a city that, he said, quoting the text in English, knows no

发表于:2019-01-17 / 阅读(39) / 评论(0) 分类 阅读空间

The Aeneid by Virgil 《埃涅阿斯纪》维吉尔 Mark first read the Aeneid while he was studying Latin in high school, and he recounted the story of Aeneass quest and his desire to build a city that, he said, quoting the text in English, knows no

发表于:2019-02-01 / 阅读(27) / 评论(0) 分类 阅读空间

How old is the Earth? 地球的年龄有多大? Well, by counting the number of isotopes in a sample of rock that's undergone radioactive decay, 通过对岩石样品中正经历着放射衰变的同位素计数, geologists have estimated the Ear

发表于:2019-02-13 / 阅读(33) / 评论(0) 分类 TED演讲教育篇

It looks like a hand of God reaching out into the cosmos, but NASA says the display is caused by a young and powerful pulsar. Taken by NASA's Chandra X-ray observatory from it's orbiting 360 miles above the Earth, the recently released photo of Pulsa

发表于:2019-02-16 / 阅读(72) / 评论(0) 分类 实用英语
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Ababil
accident mitigation
adjoining administration
apply names
aroma jewelry
astringed
automatic can-transport system
billing software
blacklined
Bothidae
by-chamber
Cam Loch
cemented carbide alloy
centrifuge rotor
cercospora solanimelongenae chupp.
christine
conserved vector current model
constant-reaction design
cony-catcher
Counterpart items
cymatiidaes
Daq-jiu
dead stall
dealey
density scale
deposits outstanding of all banks
down loading
duffing
emotional experiences
Eq.
gingival space
give the business
Glinka, Mikhail Ivanovich
glocalisation
glomeroplasmatic
grading
Grosser Müggelsee
gumpert
Gura Galbenei
harmonization of customs procedure
Hippolytia
inventory card
involute function
islwyn
java-based
jerabek
jolliff
kleier
latent demand
lutra felina
Manchester International Airport
membrana cricothyreoidea
membranous dusting tube
meteorologic network
microfibres
morson
multimedia cataloging database
net time
ngom
Novomakarovo
omental cyst
pending action
perelandra
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polyorganometallosiloxane
pond crucian carp
pre-disposal treatment
private automatic telephone system
propulsive control
public liability insurance
Purdue hand precision test
radio defense
repartner
Richard Roe
second-order nonlinear effects
secondary generation neutrons
shooting ring
sine method
skateboardlike
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sleprie
soft iron ball
spur-gear drive
strain-aging
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sudoric acid
sulfahydryl enzyme
Sǒraksan
tailing launder
texttospeech conversion
thick set
thirded
tie rod ball stud
trade size
treatment program
two pinned arch
wage-rental ratio
war and special loss
water demineralizing
wide flange I-section
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