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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acute alcoholism
air lock type head
alignment feeder
animal-feed
autodifferentiation
b-quark
ball-room
Balvi
banos de molgas
bearing end-shield
Birmingham wire gage
body bomb
brake pulse
cabbage stalk
cardiac vertigo
channel of communication
Chiaravalle
ciproquinate
civil order
co-patentee
coring conventional
course of an action
cyber space
decimal point lamp
delaware bays
diazonaphthoquinone
distell
domical architecture
dorsosublateral hysterosomal seta
eisenstassfurtite
exoration
filter analysis
Find Again
gallows birds
gas vulcanization
gene engineered antibiotic
getting bent
graphomania
hewley
high density exciton
high styles
histiocytic type
hot pot
ice cool
identical categorizations
initial hydrospheric stage
iron(Fe)
ITK
IU
jet leaching
John Braine
kepka
knuckle-nuts
laboratory activity
lachrymable
LDAC
master rod
Mile Gully
miner's pick
mononitrates
multiple metering
never-was'er
non-records
normal specular reflectance
once
opressive
overall soil preparation
parallel processings
plotting apparatus for pairs of photographs
Possession vaut titre.
powder diffraction method
power pump
Pseudacris
pythagoras ware
rafoxanide
rare minute echoes
replication
resistance-heated high temperature fluidized bed
Ronce-les-Bains
salt water soap
sarek
self closing valve
sinopanax formosana
skiophilous
sodium carboxymethylcellulose
Sorani alphabet
stage ejector
steadied
sterling white
storage fragmentation
submeters
surfaceequivalent
thalwind
toasted garlic
trans fat
underground works
uniform ergodic
uramino-
vibrating core knockout machine
white vinegars
wintertimes
wrang