时间:2018-12-27 作者:英语课 分类:英语时差8,16


英语课

The Hammerhead’s Hammerhead These unique sharks have heads resembling flattened 1, T shaped hammers. But how would such a weird 2 head evolve? One hypothesis is that having their eyes spaced far apart might give these sharks better 3D vision. Another hypothesis is that sharks use the hammerhead literally 3, smashing it against the ocean floor to stir up prey 4. But both of these hypotheses have been ruled out experimentally. The hammer head may improve the sharks’ maneuverability and stability in the water, but more studies are needed to know if or how the hammer shape improves the sharks’ swimming abilities. What else could explain the hammer shape? It may have to do with electricity! All sharks have a special sensory 5 system to detect weak electrical fields emitted by all marine 6 animals. Sharks use this electro sense to find hidden or camouflaged 7 prey. Researchers at the University of Hawaii found that hammerhead sharks have more electrosensory pores per surface area than other sharks do. In addition to higher pore density 8, their wide head gives hammerheads a larger search. In tests, hammerheads were better able to find buried artificial electrical targets using the electroreceptors in their wide heads than non hammerhead sharks were. It’s sort of like scanning the beach with a metal detector 9. If the diameter of your metal detector was bigger than that of your friend’s, you’d have the advantage since you could cover more area faster than she could. Like with a larger metal detector, the wide flat hammer shaped head might allow hammerheads to scan for prey more efficiently 10 than their competitors.



1 flattened
[医](水)平扁的,弄平的
  • She flattened her nose and lips against the window. 她把鼻子和嘴唇紧贴着窗户。
  • I flattened myself against the wall to let them pass. 我身体紧靠着墙让他们通过。
2 weird
adj.古怪的,离奇的;怪诞的,神秘而可怕的
  • From his weird behaviour,he seems a bit of an oddity.从他不寻常的行为看来,他好像有点怪。
  • His weird clothes really gas me.他的怪衣裳简直笑死人。
3 literally
adv.照字面意义,逐字地;确实
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
4 prey
n.被掠食者,牺牲者,掠食;v.捕食,掠夺,折磨
  • Stronger animals prey on weaker ones.弱肉强食。
  • The lion was hunting for its prey.狮子在寻找猎物。
5 sensory
adj.知觉的,感觉的,知觉器官的
  • Human powers of sensory discrimination are limited.人类感官分辨能力有限。
  • The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。
6 marine
adj.海的;海生的;航海的;海事的;n.水兵
  • Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • When the war broke out,he volunteered for the Marine Corps.战争爆发时,他自愿参加了海军陆战队。
7 camouflaged
v.隐蔽( camouflage的过去式和过去分词 );掩盖;伪装,掩饰
  • We camouflaged in the bushes and no one saw us. 我们隐藏在灌木丛中没有被人发现。 来自《现代英汉综合大词典》
  • They camouflaged in bushes. 他们隐蔽在灌木丛中。 来自《简明英汉词典》
8 density
n.密集,密度,浓度
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
9 detector
n.发觉者,探测器
  • The detector is housed in a streamlined cylindrical container.探测器安装在流线型圆柱形容器内。
  • Please walk through the metal detector.请走过金属检测器。
10 efficiently
adv.高效率地,有能力地
  • The worker oils the machine to operate it more efficiently.工人给机器上油以使机器运转更有效。
  • Local authorities have to learn to allocate resources efficiently.地方政府必须学会有效地分配资源。
学英语单词
a. gastroduodenalis
absolute specificity
active improvement trade
air guide sleeve
Alitalia
allelocatalytic
anticlimaxes
Antoku
Aquincum
Arabically
asymptotically most powerful test
battering train
binary B-tree
blind landing experiment
blousons
by-pass valve of screwdrill
caemxid
capacity characteristic curve
capital-raisings
civilness
coated fertilizer
color graphic terminal
comment line
completely elastic collision
compound pistil
Devaprayāg
dial-around
discharge in vacuum
dorsal ligament of radiocarpal joint
double shift
double twist
drain (hydraulic)
dynamic swell-up
emicin
extradigestive
Ferrodickinsonite
fgas
flipper-turn
follow-the-point
gammabufagin
gas turbine base load operation
general derivative
genus Amphisbaenia
gismondite
gormet
gubbing
hagedoorn
harneys
hot-short iron
industry zone
Joinville I.
Kasouri
krippendorff
lacery
lifting lug(eye)
lone-parent
Meerle
menstrual epilepsy
n. petrosus profundus
neon voltmeter
nonlinear directional coupler
nonreductionism
offers up
ORMC
percentage non-proportional elongation at maximum force
personal communications service
phagolessin
Polvadera
polystyrene-plywood laminate
probability of failure to operate on command
race for president
redelegations
resolution in line direction
rotating drum
santuccis
scanned laser infrared microscope (slim)
Shannon Airport
shoe flower
short-term capital movements
Skefilsstadhir
sleepery
smilin
sponge dermatitis and sting
stacking density
stellera formosana
stooged
succession per universita
sunnyslope
syndrome of remained toxicity
talked back
territorial classification
testifies
tingriensis
tinsmithy
tittish
towzer
transmission star coupler
type of green space
variation per cent
velocity temperature curve
Walpole, Horace
Yǒngan-gun