时间:2019-01-08 作者:英语课 分类:Scientific American(八)月


英语课

Blue whales off the California coast make calls that, sped up 10 times, sound like (sound of two-part call). The original is a wall-rattling frequency too low for us to hear. Scientists analyzed 1 around 2,500 of those calls, and found that the second part (sound) is nearly identical in pitch every time from each whale: 16 hertz, or four octaves below middle C. And the slight variations in frequency that do exist are only a tenth of the difference between a C and a C sharp. Those findings appear online in the Journal of the Acoustical 2 Society of America.


The researchers don't know how many different individual whales they caught singing, or why even they sing at all. But past studies suggest only blue whale males make calls like this. So the investigators 3 speculate that males might synchronize 4 to a single common pitch as a sort of mating beacon 5.


Thanks to the Doppler effect, females swimming towards a male would hear a slightly higher pitch; swimming away, a lower-pitched moan. Serenade out of tune—you might be swimming solo tonight.


Thanks for the minute. For Scientific American's 60-Second Science, I'm Christopher Intagliata.

 



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》
adj. 听觉的,声学的,音响学的
  • This system can set up acoustical resonances. 这种系统能产生共鸣。
  • The relevance of acoustical principles is by no means limited to sound and hearing. 声学原理并不仅仅适用于声音和听觉。
n.调查者,审查者( investigator的名词复数 )
  • This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
v.使同步 [=synchronise]
  • The sound on a film must synchronize with the action. 影片中的声音必须与动作配合一致。
  • You must synchronize your Inbox before selecting additional folders. 在选择其他文件夹前,您必须同步您的收件箱。
n.烽火,(警告用的)闪火灯,灯塔
  • The blink of beacon could be seen for miles.灯塔的光亮在数英里之外都能看见。
  • The only light over the deep black sea was the blink shone from the beacon.黑黢黢的海面上唯一的光明就只有灯塔上闪现的亮光了。
学英语单词
agricultural entomology
Alexander III
amdinocillin pivoxil
amini
ammonium picrate
antediluvially
appointed surveyor
arteriae lenticulostriata
Aucubaceae
bacillus sulfhydrogenus
bathub capacitor
bayzhansay (baydzhansay)
bike-shop
bullet-shaped virus
calf scour
champaigns
charter agreement
chieftainships
claybeg
closely-held company
con-agra
coordinated geometry
Copeton Res.
cowpe
cyberphobias
dasmann
data stream interface
data-analytics
death-bed declaration
digatric fossa
discriminant
disgraciously
Drosera peltata
drug abuser
dual-powered trolley bus
facelets
false chemical equilibrium
fautriers
finite gain
folsom
frequentance
genus adenotas
Giraudoux, (Hippolyte) Jean
grand operas
Graskop
ground space
growth factor fibroblasts
heaviest
hegh-speed lathe
histopathologists
history sheets
Hueppe's disease
I-1
introduction to education
Kaap R.
lamanche
lanthanum crown glass
light housework
maltreateth
mean circulatory filling pressure
Menest
miniparade
mounting jig
n-ary form
nanolux
nesea
not care a hoot
nuchal eminence
oatmeals
oberlander
oil-lubricating bearing
osteogenic sarcomas
palladin
pamelors
Pan Africanism
partial regression
Peronosporaceae
piratelike
Portulaca oleracea
potance file
Puccinellia jeholensis
retransitivize
ribosome entry site
sea effect
simple fan
Skomer I.
solutions architect
sortie duration
speed clutch control handle
Staphylococcus cereus flavus
strength in tension
submarium
sugar beet combine
tachometer drive cable
take steps to do sth
to make something
total normal force
unicode state assignment
v. intercostalis suprema
verification of measuring instruments
yarn beam bracket
zone of weakness