时间:2018-12-26 作者:英语课 分类:美国英语听力80篇


英语课

[00:05.75]Last month, scientists announced that they recorded the first detailed 1 maps

[00:13.06]of the development of a child's brain between the ages of three and fifteen.

[00:19.98]Scientists at the University of California at Los Angeles School of Medicine led the group of scientists.

[00:29.68]The study appeared in the magazine "Nature".

[00:34.01]The researchers say their study provides new information

[00:39.42]about what areas of the brain are used in learning 2 at different ages.

[00:45.22]The scientists at the University of California invented a process

[00:52.17]that let them map brain growth in greater detail than ever before.

[00:57.31]They used a machine called an M-R-I to take a picture of the brain of each child in the study.

[01:06.14]Using a computer the scientists identified millions of areas of each brain.

[01:13.64]They took more pictures of each child's brain during the fouryear study.

[01:20.61]Then they mapped the changes in position as the brain developed.

[01:25.03]The scientists mainly observed growth in the area of complex nerve 3 tissue 4 called the corpus callosom,

[01:34.75]This area sends information between the two halves of the brain.

[01:40.28]They say they found that a child's brain experiences two main periods of growth.

[01:48.09]The first takes place between the ages of three and six.

[01:53.53]The greatest growth appears in an area of the corpus callosom in the front of the brain.

[02:00.76]This area is involved in learning new skills,planning and organizing new actions and working on an activity.

[02:09.78]The second period of brain growth takes place in the middle and back areas of the corpus callosom from age six to twelve.

[02:20.77]The most growth was in the areas of a child's brain involved in language skills and understanding relations in space.

[02:30.54]The scientists say it is during these quick growth periods that the brain is best able to learn.

[02:39.11]Scientists say the brain overproduces some cells when it grows.

[02:45.38]The new cells organize into networks based on the connections that are used in mental or physical activity.

[02:55.96]Cells and pathways used often form strong permanent connections.

[03:02.67]Those used least die out as the brain returns to its normal size.

[03:09.86]Scientists have known that such periods of growth and shrinkage happen before birth and in very early childhood.

[03:20.91]And, they knew that the brain network connections continued to change until about the age of five.

[03:29.97]But this study and two similar studies released 5 late last year are the first to suggest the process continue to adulthood 6.

[03:40.71]The scientists say their study may explain why the ability to learn new languages generally decreases after the age of twelve



1 detailed
adj.详细的,详尽的,极注意细节的,完全的
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • A detailed list of our publications is available on request.我们的出版物有一份详细的目录备索。
2 learning
n.学问,学识,学习;动词learn的现在分词
  • When you are learning to ride a bicycle,you often fall off.初学骑自行车时,常会从车上掉下来。
  • Learning languages isn't just a matter of remembering words.学习语言不仅仅是记些单词的事。
3 nerve
n.神经;勇气,胆量,沉着,果断
  • Did he have the nerve to say that?他竟有脸说这话吗?
  • He never got up enough nerve to meet me.他从没有足够的胆量来见我。
4 tissue
n.组织;薄纱,薄纸,手巾纸
  • As we age we lose muscle tissue.肌肉组织会随着我们日趋衰老而萎缩。
  • Athletes have hardly any fatty tissue.运动员几乎没有什么脂肪组织。
5 released
v.释放( release的过去式和过去分词 );放开;发布;发行
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • With hindsight it is easy to say they should not have released him. 事后才说他们本不应该释放他,这倒容易。
6 adulthood
n.成年,成人期
  • Some infantile actions survive into adulthood.某些婴儿期的行为一直保持到成年期。
  • Few people nowadays are able to maintain friendships into adulthood.如今很少有人能将友谊维持到成年。
学英语单词
additive batches
algorithm module
aligning gear
backfilling gang
Ban Pla Soi
biostatistician
Blotchside
calibration transfer instrument
cautionate
closed sterilizer
coal grinding
communication among independent tasks
complete puberty
compound hyrograph
connections through marriages
constructional alloy steel
countertops
Crouy-sur-Ourcq
cutex
cyclopentylene
Cynodontinae
delivery line refrigerant velocity
Digisidin
dirham
Dobuan
document of clearance
double declining balance
electroptic range finder
Eurodeputies
evenson
faburdens
fast(-neutron) flux
fire devil
firecracker flower
fixed field record
forinstance
front-end fee
gibbousness
Gohana
great-cousin
haags
hackneydom
heart channel of hand-Shaoyin
Heberden's disease
Hybodus
i-strewed
IM her
inflation impact statements
inspiratory centre
iodized colllodion
knifemaking
limited tax bonds
lolicons
loys
mass flow (rate)
meiolithic
methane generating
mild toxemia of pregnancy
montunos
nestls
never for a single minute
newbould
non-biting midge
omental cyst
on the installment plan
one-upwomanship
oral anomaly
overrings
pachytene stage meiosis
Paseaine
phthalidisoquinoline alkaloid
Pleasant Mound
plot data
post-emulsification penetrant
post-primaries
postal administration
potential for diversion
pre-cooling
PVAL
quantitative model
rack of bones
Saint Anselm
sandiest
selcall
shabu shabu
skidegate
slagging constituent
slitlike
smeared-out boundary
soda-hornblende (arfvedsonite)
step logic
stoppering
student bodies
surdimutitas
surface-treatment
tahitis
thurlestone
toquillas
tweendeck bulkhead
WKW
wml
zawinul