时间:2019-01-08 作者:英语课 分类:Scientific American(十二)月


英语课

 Porcupines sport some 30,000 quills 3, which easily penetrate 4 flesh—and then stay stuck in it. Now, scientists have analyzed 5 the shape of individual quills to discover what makes them so effective—and how we can harness their power for medical devices. The study is in the Proceedings 6 of the National Academy of Sciences. 


 
The black tip of each quill 2 features backward-facing barbs 7. These barbs are tiny: a row of two hundred of them would be short of an inch long. The barbs help a quill penetrate flesh more easily than a hypodermic needle of about the same diameter, and using only half the force required to push a barb-free quill through tissue. Once the quill is in, the barbs then greatly increase what force would be needed to pull it back out again.
 
The researchers think understanding porcupine 1 quill properties can help them make less painful needles, because of the lower force needed for penetration 8. Also stickier adhesives 9, because of the greater force needed for removal. And the study reminds us that you really, really don't want to mess with a porcupine.

n.豪猪, 箭猪
  • A porcupine is covered with prickles.箭猪身上长满了刺。
  • There is a philosophy parable,call philosophy of porcupine.有一个哲学寓言,叫豪猪的哲学。
n.羽毛管;v.给(织物或衣服)作皱褶
  • He wrote with a quill.他用羽毛笔写字。
  • She dipped a quill in ink,and then began to write.她将羽毛笔在墨水里蘸了一下,随后开始书写。
n.(刺猬或豪猪的)刺( quill的名词复数 );羽毛管;翮;纡管
  • Quills were the chief writing implement from the 6th century AD until the advent of steel pens in the mid 19th century. 从公元6世纪到19世纪中期钢笔出现以前,羽毛笔是主要的书写工具。 来自《简明英汉词典》
  • Defensive quills dot the backs of these troublesome creatures. 防御性的刺长在这些讨人厌的生物背上。 来自互联网
v.透(渗)入;刺入,刺穿;洞察,了解
  • Western ideas penetrate slowly through the East.西方观念逐渐传入东方。
  • The sunshine could not penetrate where the trees were thickest.阳光不能透入树木最浓密的地方。
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
n.进程,过程,议程;诉讼(程序);公报
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
n.(箭头、鱼钩等的)倒钩( barb的名词复数 );带刺的话;毕露的锋芒;钩状毛
  • She slung barbs at me. 她说了些讥刺我的话。 来自《简明英汉词典》
  • I would no longer uncomplainingly accept their barbs or allow their unaccountable power to go unchallenged. 我不会再毫无怨言地洗耳恭听他们带刺的话,或让他们的不负责任的权力不受到挑战。 来自辞典例句
n.穿透,穿人,渗透
  • He is a man of penetration.他是一个富有洞察力的人。
  • Our aim is to achieve greater market penetration.我们的目标是进一步打入市场。
黏合剂( adhesive的名词复数 )
  • These include dyes, adhesives, solvents, detergents, metals, and other foreign materials. 其中包括染料,粘合剂,溶剂,洗涤剂、金属等外界物质。
  • Preparation, properties and kinds of polyurethane adhesives were described. 综述了聚氨酯胶粘剂的合成、特性和种类。
学英语单词
accessory fissure
Afonso I
Angelrest
Araia
archidont
atmospheric radiation budget
baby makers
barium chloride poisoning
batable property
be awake
beleaguer
blackshoe
blue-eyed African daisy
by fire
Cavalli Is.
cereal science
Cissus adnata
clostocin
coarse thread
connecticut r.
counts per turn
Cyperus involucratus
DAW (dry active waste)
deep oil
disprovide
eldrinson
errant conception
esculentas
excision-junction
fidelity card
fixed loans unsecured
flashing back to
foot pedals
fruit dove
Galata
group occulting light
HC2/bikunin
herbar
hertle
high pressure sterilization
Homer Armstrong Thompson
hydraulic selector
hydrautorque-hinge hatchcover
isocortices
karl wilhelm siemenss
khadr
Khorram Darreh
Kichai
Komshtitsa
Lactuca sibirica
leatheries
lefthanded screw
let a contract
level of access
loading of air pollutant
Lunderskov
Marasesti(Marasheshty)
micorhymenopteron
milk ability
mirror punishment
molecular sieve separation
monotriglyphs
multipath simulator
multipresent
muscular rigidity
night colour television
numerous small and low echoes
ozarkite (thomsonite)
p - type semiconductor
passata
pepine
pin electrode
piston stop
Potamogetonales
progressive amaurosis
prutzman
punky wood
radices gelsemii
radio-photo-luminescence
Rami nasales interni
rappelers
rates relief
resistive two-terminal element
resource allocation and network scheduler
run amok
running balk
scenting
Sears, Paul Bigelow
semen hyoscyami
setting - up exercises
singles bars
small gain theorem
steel slab bridge
still wave shearing force
stress relieving
Supertherm
tourbillion
Tótszerdahely
us seal
vinylic foam
wearying of
yucheng