时间:2019-02-24 作者:英语课 分类:英语听力文摘 English Digest


英语课

  D: OK, Yael, you want to build an aquatic 1 robot,and you're trying to figure out the most efficient way to move it through water, what do you do?

Y: I am guessing the answer isn't to build a robot using a lot of root-force to move forward?

D: Anyone who has tried walking or running in water knows how much effort that can take compared to swimming, which by the way is a hint.

Y: It is?

D: Look at the fish, my friend. Many fish after all, live in turbulent waters.

Y: I see where this is going. Over time, fish have made adaptations to conserve 2 energy when swimming against the current.

D: And researchers at Harvard figured out the underlying 3 physics.

Y: So they literally 4 understand what it means to swim like a fish?

D: Yes. You see, when water hits objects like branches, rocks, or other fish, it forms strings 5 of little whirlpools, or vortices. So researchers set up a tank with water flowing in one direction, and dropped a cylinder 6 in it that generated vortices.

Y: So what did they find out?

D: The researchers observed that rather than fighting the current, the fish simply slalomed between vortices, using a swimming style that resembles a flag flapping in the wind. The advantage of all the side-to-side movement is that it requires very little muscle activity. In fact, fish can use this technique to hold their position and rest while in rough patches of water.

Y: I bet that comes in handy for swiming up a fish letter.

D: These findings have applications ranging from technology to conservation.

Y: And it gives us a whole new dimension of what it means to swim like a fish.



adj.水生的,水栖的
  • Aquatic sports include swimming and rowing.水上运动包括游泳和划船。
  • We visited an aquatic city in Italy.我们在意大利访问过一个水上城市。
vt.保存,保护,节约,节省,守恒,不灭
  • He writes on both sides of the sheet to conserve paper.他在纸张的两面都写字以节省用纸。
  • Conserve your energy,you'll need it!保存你的精力,你会用得着的!
adj.在下面的,含蓄的,潜在的
  • The underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。
  • This word has its underlying meaning.这个单词有它潜在的含义。
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。
n.弦
  • He sat on the bed,idly plucking the strings of his guitar.他坐在床上,随意地拨着吉他的弦。
  • She swept her fingers over the strings of the harp.她用手指划过竖琴的琴弦。
n.圆筒,柱(面),汽缸
  • What's the volume of this cylinder?这个圆筒的体积有多少?
  • The cylinder is getting too much gas and not enough air.汽缸里汽油太多而空气不足。
学英语单词
alizarin dye
alphabet rhyme
aminoacyltransferase
amp-hours
ampliator winding
analog sensor
and-answer
back pack camera
barrel shroud
bituminous composition
brinfir
Brynilen
builds-in
Burchak
capacitive impedance
Castanopsis ferox
catechumenists
cephalohematocele
chalkes
chamberstick
chanciest
christened
classical decision
coalbumin
colour-serjeant
coordinate measuring instrument
Corydalis borii
Debno
DEC (distance echo correction)
dorotheos
ecology-minded
efters
electric multipole field
electrochemical amplifier
extramembranous pregnancy
F-reactive dye
Faial, Can.do
film pressure
flat plug
force into
functionally-distributed data base
geckotians
glyhexamde
hagiolatrous
high orbital bombardment system
holism
image iconoscope
Information Technology Infrastructure Library
insulation moisture content of a transformer
jackaroo
James Gillray
key sequence number
Lami theorem
log billet
mallanders
mckibbin
mental quickness
metallurgical-microscope
metatect
methylidene
microdots
minispheres
multi die machine
Muntadgin
Musculus chondroglossus
naclex
nailfolds
net before petroleum revenue tax
nonforensic
nonsensing
optical black
outline feed
papilloretinopathy
past consideration
pericardiaco-phrenic ligament
petroleum base hydraulic oil
portable battery
post-contractual
pre-electric shave lotion
punch forming
quixotries
rainshadows
Ramanathapuram
right engine pylon
rocker beam
royal osmunds
sparkover
specmarks
spunin
Stearophanic
Sudan grass
tenebrousnesses
turnip cutter
umms
underfeatured
Unimycin
user's block diagram
Vagabondia
Vas lymphocapillare
wizardlings
woollyflower paullinia
X bosons