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This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. Many of the key molecules for life have a specific direction, or handedness: DNA twists to the right, amino acids to the left. Now scientists at the Nation

发表于:2018-12-24 / 阅读(44) / 评论(0) 分类 Scientific American(四)月

banister, ['bnistə] n (楼梯的)栏杆=balustrade=rail 【记】ban挡住,ister东西-挡住的东西-栏杆 【类】staircase:banister=garden:fence楼梯需要栏杆保护=花园需要栅栏保护

发表于:2018-12-30 / 阅读(33) / 评论(0) 分类 不择手段背单词

Three radio stations in the United States mainly broadcast one thing: the official time. The three are radio stations WWV and WWVB, in the state of Colorado, and WWVH, on the island of Kauai in Hawaii. They send out signals that are used by millions

发表于:2019-01-03 / 阅读(53) / 评论(0) 分类 2018年VOA慢速英语(九)月

Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol

发表于:2019-01-08 / 阅读(48) / 评论(0) 分类 Scientific American(八)月

Next year will mark the 110th anniversary of a U.S. government agency that is unknown to most Americans. Yet its work affects their everyday lives in countless ways. Generations knew the agency as the National Bureau of Standards. When it was founded

发表于:2019-01-14 / 阅读(38) / 评论(0) 分类 VOA标准英语2010年(十一)月

Tell me, Mechanist, is it true? Does none of it bother you? Once upon a time Upon a time behind us The mechanist inclined Clockworks of time define us Who you are, who you are; Merely springs that tick The time of things away The cry from the beast i

发表于:2019-02-25 / 阅读(70) / 评论(0) 分类 英文摇滚歌曲
学英语单词
absent referents
agnellis
allyl rearrangement
armature stop
armenius
asymptotically efficient estimate
Back L.
butterworth approximation method
carbon-black seeding
chemical combination
clam worm
Clarington
clonings
Coccidae
coefficient of determination
concentrated fruit
corner reflectors array
Coulman I.
criollas
derbur
Desmidium
discus proligerus
distribution box
djakovica (dakovica)
domains walls
duplicate copy of invoice
enrange
entourage effect
family economics
firmware realization
general course
grammatologists
gypsum dehydration
hepatic lymphnodes
house (service water ) tank
initial purity
insiderisms
internal electromagnetic pulse
invacuate
iviss
lcc (1)
lengthenest
letters of marque (and reprisal)
Liley
maieutically
marketing board
matter era
molecular biology of plant development
monometflurazone
Monro's gland
msma
muehl
multitarget
neonatal albinism
non-opening die
opening operation
optimal switching
optimum catch
out-throw
peddle alibis
perfect competition
permanent magnetic composite
perplexingness
plugcoupled
Pompué, R.
portfolio careers
post-apostolic
pseudomultivalent
Puccinia cacao
puoztas
quad raster operational chip
reduction of cross sectional area
repetatus
retarding potential
roscoes
Schridde's cancer hairs
SCMM
SCREENEX
singlino
slides-in
soft computer programs
standard detail
super-fit
superstructed
Terrier'svalve
That'll teach you.
tilling machine
Tiruvettipuram
tolowr
toucan
transient hot channel factor
trimestre
Tupungato, Cerro
tzaddiq
Veratrum nigrum
vibrational severity
whitewashed
wood form
Wren-Thrush
Xiaguan
yamamomo
ZEIX