时间:2019-01-08 作者:英语课 分类:Scientific American(二)月


英语课

 It's tough to be a machine in the desert. Particles of dirty sands walk their way in to moving parts where they break turbine's motors pipes on other equipment.To avoid the costly 1 warranty 2, researches are taking lessons from a desert native, the yellow fat scorpion 3. Scorpion protect their bodies with exo-skeletons in order to minimize rubbing from air-born sand. The pattern on this armor modify the way that air flow over the scorpion's back. The researches scan the scorpion's body and use the natural pattern in inspiration for a variety of surfaces. With the computer model to simulate the airflow over the digital surfaces and wind tunnel for testing the physical samples, the researches are trying to develop the best texture 4 for avoiding sand damage. Their work is in the Material Science Journal Annual. Although all texture surfaces feel better than smooth ones, one type of pattern resist the erosion best. Small dews cut the 30 degree angle to direction of the airflow. The machine whose surfaces are engraved 5 with this texture should fight off the erosion like the scorpion do, where smoother equipment comes to the sting of sand.


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adj.昂贵的,价值高的,豪华的
  • It must be very costly to keep up a house like this.维修这么一幢房子一定很昂贵。
  • This dictionary is very useful,only it is a bit costly.这本词典很有用,左不过贵了些。
n.担保书,证书,保单
  • This warranty is good for one year after the date of the purchase of the product.本保证书自购置此产品之日起有效期为一年。
  • As your guarantor,we have signed a warranty to the bank.作为你们的担保人,我们已经向银行开出了担保书。
n.蝎子,心黑的人,蝎子鞭
  • The scorpion has a sting that can be deadly.蝎子有可以致命的螫针。
  • The scorpion has a sting that can be deadly.蝎子有可以致命的螫针。
n.(织物)质地;(材料)构造;结构;肌理
  • We could feel the smooth texture of silk.我们能感觉出丝绸的光滑质地。
  • Her skin has a fine texture.她的皮肤细腻。
v.在(硬物)上雕刻(字,画等)( engrave的过去式和过去分词 );将某事物深深印在(记忆或头脑中)
  • The silver cup was engraved with his name. 银杯上刻有他的名字。
  • It was prettily engraved with flowers on the back. 此件雕刻精美,背面有花饰图案。 来自《简明英汉词典》
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About face!
accommodative strabismus
afear
alchemistic period
attention signal
axle key
bad fussing
beloud post (dezadeash)
blockships
boomeranger
brachycnemic
brinksmanship
calcifiers
coal clauses
cobblestone street
conjugation,zygosis
cornucoquimba gibba
creditor account
damping fin
database design aid
dentale(dentary)
department of navigation and aviation
die-locking toggle
durlacher
endstone for pallet fork
enemy agent
flux oil
FPGAs
gage-pole
gangler
glactosylcerebrosidosis
growing of vine of grape
guanaco
gymnasticss
hochschules
human learning and intelligence
humeral veinlet
hydatid pregnancy
imploringness
impregnated ovum
inconnus
infossate
irreversible transformation
Kasba L.
kefir grains
Kundaria
Lossiemouth
Machilus rehderi
machine-age
magnetic tools
malleable castings
massimiliano
maytansinol
megatheroids
MS4-component
near infrared rays
negative shrinkage
nitrotyrosine
non-linear spring
nonparoxysmal tachycardia
nontranscendental
ortho-Lomonosovite
oscillating conveyer
Owenke
pantoner
parafrontal bristle
parallelogram lindage
permit holder
pinjoint ship
polhode
principle of universality
protective system false operation rate
put in circuit
put the finger on
radt
reaccedes
reactive armor
regularobufagin
respiratory accentuated
roller box
Salix neolapponum
school-funding
sector address system
self-oscillation
sinus a. pulmonalis
sludge emulsion
smithgall
sports equipment
staying-powers
stub impedance transformer
surefoot
system utilization
The Great Charter
tonnest
torpedo boat
transeminent
tubercle of anterior scalene muscle
vbm
voluspa
waveshaping
Wegener-Bergeron process
Z-nickel