时间:2019-02-23 作者:英语课 分类:英语时差8,16


英语课

 A long wait, on this Moment of Science.   You might have heard the old adage 1 that glass is a liquid, and if you go over to Europe and look at the stained glass windows in the cathedrals, you'll find them thicker on the bottom than the top because they are gradually spilling out. Is this true?


Before we answer that one, let's take a second to think about what a cool image that is. Maybe if you lived for centuries instead of years, you could sit around and watch glass pour the way we watch molasses ooze 2 out of a jar.
Well, sometimes little factoids like this get passed around that may or may not be accurate. So, to set the record straight, glass is indeed a very slow-moving liquid -- yep! -- given the standard definition of a liquid, which is something that takes the shape of its container. If you could wait a really, really long time, you might be able to watch a seemingly-solid piece of glass do this.
But it would take a lot more than a few centuries. In fact, a recent study by Edgar Zanotto in the American Journal of Physics showed that the amount of time you'd have to wait to see glass change its shape with the naked eye would be longer than the age of the universe! Those cathedral windows are probably thicker in some places just because of the crude methods used to form them.
So, yes, technically 3 glass is a liquid, but no, you can't ever see it move. Unless you have a few billion years to kill.  

n.格言,古训
  • But the old adage that men grow into office has not proved true in my experience.但是,根据我的经验,人们所谓的工作岗位造就人材这句古话并不正确。
  • Her experience lends credence to the adage " We live and learn!"她的经验印证了一句格言: 活到老,学到老!
n.软泥,渗出物;vi.渗出,泄漏;vt.慢慢渗出,流露
  • Soon layer of oceanic ooze began to accumulate above the old hard layer.不久后海洋软泥层开始在老的硬地层上堆积。
  • Drip or ooze systems are common for pot watering.滴灌和渗灌系统一般也用于盆栽灌水。
adv.专门地,技术上地
  • Technically it is the most advanced equipment ever.从技术上说,这是最先进的设备。
  • The tomato is technically a fruit,although it is eaten as a vegetable.严格地说,西红柿是一种水果,尽管它是当作蔬菜吃的。
学英语单词
a slut
Alliance for Progress
artificial duct
asymptotic slope
beldame
bid-price
bierstekers
blank map
Briss
catheretic
cathodic protection automatically controlled
causeymakers
cet. par.
chilauni
Coffeen Lake
compost grinder
Conia.
cooled-air circulation refrigeration machine
crystal sender
denalis
dibenzyltin dibromide
earth filtering
epoxy-amine resin
financial services sector
Fluvoxaminum
FSBO
fuel-savings
gadolinites
gosther
hard to get
hide your light under a bushel
high-centre
hokiangas
hopper freight car
Humbauville
if push comes to shove
integral ring
isdn digital subscriber line
Kichma
larval molting
lime arsenate
lineshaft
loovesum
m mode ultrasonic scanning
mass extinction coefficient
Mead, Margaret
medullary plate (or neural plate)
metal halide
metauranopilite
microsporosis capitis
My Quang
nonelement
oceanic bonitoes
office of prime minister and cabinet
Olintepeque
outline bar
palaeocon
phellodendron amurenses
piezoelectric driver
pillar crane
plasterable
political agenda
polyp of rectum
polyphenylene sulfide composite
priscillians
pullig
quadrumana
records service firing
rocker keel
roof structure to falls
rotating coupler
Rotava
salsaed
sindony
sisso
sodium metazirconate
speedometer main shaft
squeakless
stereocamera
stiklestad
studio floor
subgalea
subsurface trickle irrigation
superparts
supervacaneousness
television tape
text library
the fine print
the presence or absence of anthocyanin pigments
the sweets and bitters of life
thrust lift nozzle
time trial
unilateral hermaph-roditism
uniprocessor system
unrestless
value number
vertical phasing
vibration regulation law
wastoid
water bone infection
xestia csoevarii
yolk sphere