音标:[,tetrә'tɔmik] ;
四原子的
a. Consisting of four atoms; having four atoms in the
molecule, as phosphorus and arsenic.
a. Having a valence of four; quadrivalent; tetravalent;
sometimes, in a specific sense, having four hydroxyl groups, whether
acid or basic.

This is Scientific American Sixty Seconds Science, I'm Sophie Bushwick, got a minute? When Mexican tetra fish moved into darker caves long ago, they evolved to deal with the dark by becoming albino and going blind. A new research shows that the chang

发表于:2018-12-24 / 阅读(186) / 评论(0) 分类 Scientific American(一)月

T Tanshinone IIA 丹参酮IIA Tanshinone I 丹参酮I Tanshinone IIB 丹参酮IIB Taraxasterol 蒲公英甾醇 Taraxerol 蒲公英赛醇 Tauro ursodesoxy cholic acid 牛磺熊去氧胆酸 Taxifolin 花旗

发表于:2019-01-03 / 阅读(157) / 评论(0) 分类 医务英语

close your eyes give me your hand, darling do you feel my heart beating? do you understand? do you feel the same? am i only dreaming? is this burning an eternal flame? i believe it's meant to be, darling i watch you when you are sleeping you belong

发表于:2019-01-07 / 阅读(216) / 评论(0) 分类 音乐咖啡厅

英文歌词: so long ago i didnt have a care about me i didnt know my right from wrong but now i know that you left got love around me you know it makes me feel so strong baby if you turn around and prove to me its real maybe we can work it out cos thi

发表于:2019-01-09 / 阅读(190) / 评论(0) 分类 音乐咖啡厅

Leading the news, the families of those killed on flight MH17 will gather in Canberra today for a national service to mark the first anniversary of the disaster. The plane was shot down over Ukraine, killing almost 300 people, including 38 Australian

发表于:2019-01-16 / 阅读(143) / 评论(0) 分类 澳洲ABC新闻快递2015年

By Stephanie Ho Washington 17 January 2007 watch Doomsday Clock report An international group of atomic scientists is warning of the dual threats to the world posed by nuclear weapons and climate change. VOA's Stephanie Ho reports from Washington. K

发表于:2019-02-01 / 阅读(205) / 评论(0) 分类 2007年VOA标准英语(一月)

MELBOURNE, Jan. 17 (Xinhua) -- Wimbledon champion Rofer Federer advanced to the third round at the Australian Open with a 6-3, 6-4, 6-4 victory over Russian Nikolay Davydenko here on Thursday. The two 31-year-olds know each other well, on court at le

发表于:2019-02-03 / 阅读(185) / 评论(0) 分类 英语新闻

10 Getting The Lead Out 第十章 把铅撵出去 In the late 1940s, a graduate student at the University of Chicago named Clair Patterson (who was, first name notwithstanding, an Iowa farm boy by origin) was using a new method of lead isotope measur

发表于:2019-02-17 / 阅读(193) / 评论(0) 分类 万物简史
学英语单词
a feast or a famine
albinismus universalis
alexanderplatzs
ampfield
antitank missile IR control
armour plated
ash-greiest
atomized metal powder
be in labor
Benzaltex
bible leaf
bleeder curcuit
Caramoan Pen.
carrot bag
cavity lining
central decomposition
chroma cancel
cicisbei
coght
com-mence
complex geometry
continuous item
corrosion- resistant titanium alloy
craftsperson
d'humeur
dentin caries
disjunctive syllogism
dry humped
durisol
dysacusis
egocentrists
equivalent functional niche
estelles
filial organism
fire hose station
fixed trip mechanical switching device
fly-cut
follow along
frame arc lamp
fullyenergized
gentilhomme
give loose
grade-school
Hedblom
holomictic lake
index time
inorganic waste
involuntary attention
jigger mast
lantzmen
late arrival
loan charge-offs
mail-box
Mainbullau
malignant bubo
maximum detectable range
metabolic water
minimum arming altitude
modern-minded
munch
myoglobinurias
nasion-mention distance
nickel chlorite
occupational dermatosis
oser
Pantobromina
Periepididymal
pile winding
piliferous tubercle
plsd
pneumococcic salpingitis
poivrot
Politecnico
proreption
PTERASPIDAE
publicizable
reversing sleeve
Reyuvenescence
rhodesianus
ruthenica
sample recovery
Scophony television system
selective detector
Shouldham
shrunk-on disc
soils in use for cropland
south tropical calm zone
specially-mades
standpat
stands-in
stem of stamp
submeningeal
sutural ligament
synchronous belt
system protection
true frost injury
unequal octave
unransomed
ureapoiesis
Venusian ionospheric sheath
water-pots
weft insertion