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
acute altitude sickness
acute angled
acute left ventricular failure
adventitions
agrilus decoloratus alazon
antifrosting
archival management
ardvreck
back pork
balanced force relay
barrier function
bottom well stripper
card gauge
chance to
citifinancial
concentrate tank
conjugon
cost contract
couplezilla
decapitated
designer goods
despatched
directory manager
dry edging
dust-out
dynamical stress
engineering machinery management
ethoxybenzene
eyepaint
fastigial nucleus
fatigue threshold
fernands
floor-type air conditioner
frequency multiplier circuit
gas metal-arc welding
grain shoot
gyrowheel
handhole cover
high tension current transformer
high-turnover
highspeed elevator
inclination of palpebral fissure
Italian Chamber of Commerce in Great Britain
ivory-like tumor
kannada
Kienbock's disease
klama
Knoxia valerianoides
laid down my arms
lipoidic
loche
manpower ulitization survey
mark memory
matrix band
Metanite
monitored
Mucuna utilis
multiple-channel recorder
newlyweds
nutrient requirements of growing swine
order myaceaes
out of fear
over all
paillyeis
paramorphous
peronin
phronema
porcelain pot
proper phasor
pseudoplacodiolic acid
pyramidic
Reuss's formula
rheography
Scots heather
separin
Seribu, Pulau
singledigit
size for connection
smallflower gorse
spontaneous behavior
spudded
station illusion
strategic focus
surface stability
synchro cut
tansey
tape error statistics
Thiobacilleae
Thomas Atkins
threshold hollow
two pedal operation
type B package
unidimensional multiple chromatography
Valsalva's method
vestel
volcanic chrysolite
wakey
walk-on-by
yure
ZMA treated timber
zuidema