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。
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activity restart cycle
Advertisement Regulation Act
Andaman Islands, Andamans
average-weight
beamtherapy
binomial distribution probability
Boselaphus
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break-even price
Bretton Woods Monetary Agreement
Briterlich variable radius technique
Changsando
channel address half word table
choga
cigar wrapping
Cinnopropazone
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coriandrol
Cremanthodium angustifolium
cross software
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crucilly
diagnoser
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Donghai
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ease someone out
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every two years
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GDP dissociation inhibitor
general inquiry
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h. h. munroes
Hanke-Koessler's tests
heldover
heteromorphous combination
hormonagoga
HTML
image-motion compensator
instantaneous error of rotation
Itapicuru
kemmons
kertzmen
kroeng
lanagan
lasta
letter stock
Lord High Chancellor
lubricating oil starting pump
mark of the beast
Mitreola
morphoanatomically
negative viscosity
noninterlocked area
only the good die young
options tariff
oral bundle
parenchyma strand
pecornut
Pedicularis siphonantha
pennorth, pennorth
phosphor laser
placodes
plant colo(u)ring matters
plug-ins
Pyrularia sinensis
reacton turbine
receiving-departure yard
reindustrialising
remote readout
rosies
rotary cultivator
s phenomenon Bordet
schmoozer
scumbered
sideelevation
sight feed siphon lubricator
single-chip
solar satellite
solvd
spot trading
Strait of Hormuz
superior phrenic arteries
tensile
tubular resistance
tyre building
ultraphysical
under-the-counters
uniform divergence
uraeotyphlids
wood-hen
Working Tax Credit
X car
xylariopsis uenoi