时间:2019-01-08 作者:英语课 分类:Scientific American(七)月


英语课

 This is Scientific American’s 60-Second Science.I'm Cynthia Graber . This will just take a minute.


 
(Chirping sound.) That may not sound likemuch–but it’s the loudest animal in the world. For its size, that is. Theinsect called the water boatman is two millimeters long. And these peeps can beheard from a stream bottom by the human ear.
 
Animals are generally constrained 1 by themechanics of size. But small creatures need to be heard as well. Researchersthought some freshwater species might rely on sound because of poor visibility.So they collected water boatmen from a stream and pond in France. Theyrecorded 13 males doing their thing. They measured the sound level and theinsects’ bodies. And they compared those figures with 227 other loud species,like elephants. And relative to its body, the little water boatman made thebiggest racket, maxing out at 99 decibels 2. The research was published in thejournal Public Library of Science One. 
 
The scientists say they haven’t figured outexactly how the tiny creature produces such volume–in part it comes fromrubbing part of its genitalia against its abdomen 3. But understanding theamplification could help us improve our own acoustic 4 technology. Usingdifferent techniques, of course.
 
Thanks for the minute. For ScientificAmerican’s 60-Second Science. I'm Cynthia Graber .

adj.束缚的,节制的
  • The evidence was so compelling that he felt constrained to accept it. 证据是那样的令人折服,他觉得不得不接受。
  • I feel constrained to write and ask for your forgiveness. 我不得不写信请你原谅。
n.分贝( decibel的名词复数 )
  • The typical lawn mower makes about 90 decibels of noise. 典型的割草机发出的声响约为90分贝。 来自《简明英汉词典》
  • A normal conversation reaches 55 decibels. 普通的谈话即可达55分贝。 来自《简明英汉词典》
n.腹,下腹(胸部到腿部的部分)
  • How to know to there is ascarid inside abdomen?怎样知道肚子里面有蛔虫?
  • He was anxious about an off-and-on pain the abdomen.他因时隐时现的腹痛而焦虑。
adj.听觉的,声音的;(乐器)原声的
  • The hall has a fine acoustic.这个大厅的传音效果很好。
  • Animals use a whole rang of acoustic, visual,and chemical signals in their systems of communication.动物利用各种各样的听觉、视觉和化学信号来进行交流。
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advertising linage
after-combustion
alternate error procedure routine
alternate protocol table
apicycline
axis-cylinder process
bevelling
ca circa
cadet branch
canalization(waddington 1940)
catching
cefadyl
Cefmetazone
chlorinating plant room
chocolate crackle
choiceset
Cinnamomum camphora
climbs on
compacted lift
consolidated group account
Dagobert III
danse du ventres
dinaphthazine
discontinuous longitudinal division
drum type shears
duli
dynamic tool display
ectoplasms
Ellison, Ralph Waldo
EPSE
exclamatory pitch
free-silver
friction zone
funcname
genetic balance
gyratory fixed-spindle crusher
high gain operational amplifier
homostimulant
horizontal plate of palate bone
hydraulic control mechanism
lipophilic
litras
loss of energy
mail pouches
make and mend
maximum wage
medipot
mistifies
mocadan
monogeosyncline
morphological convergence
multiple spindle boring machine
mummie
Mussolinian
nonhikers
Nuda
operational tool
optical superposition principle
ordinary legal action
oxpecker
Oxyconger
Pancoast's drain
pasarela
peri-natal mortality rate
phenoxyisopropylpenicillin
poly-deism
pot type burner
presbyope
print medium
pyroxene carbonatite
radioisotope gauge
reinforcement conditioning
ribbingly
sales law
scalpings
screening number
seasonal time span
selyem
semimonthly payroll
shw
single-start thread
sky market
social nature of property relations
social studies of science
soil improvement
statistic graphic symbols
stickgrenade
stirrup spacing
Strong, Mt.
sub-peritoneal space
tapestried
the pictures
the squirts
Toscaig, Loch
ultra-micrometer
unemotionalities
user node
vanilla-flavoured
vesicles
Watson strand
Wuyi
xo