时间:2019-01-13 作者:英语课 分类:VOA标准英语2010年(三月)


英语课

A 33-year-old financial analyst 1 in California recently quit his job to devote himself to an unpaid 2 job teaching math on the Internet, and his lessons are reaching almost 100,000 people a month.  In this week's edition of Making a Difference, we introduce you to Salman Khan and his Khan Academy, and the difference they make for people who struggle to learn math.


Salman Khan's disembodied voice is heard every day - by tens of thousands of students around the world who are hungry for help learning math. He has posted 1,200 lessons on YouTube...lessons that appear on an electronic blackboard, and range from basic addition and advanced calculus 3 to science and finance. And they are free.


"Introduction to Trigonometry is where I teach people about the trig functions," he explained. "This is one of the more popular videos. This has 179,000 views. And you know this is just what sine, cosine, and tangent are.


 


Salman Khan lives in California's Silicon 4 Valley, with his wife, a rheumatologist in training at Stanford University, and their new baby. He got the idea for Khan Academy four years ago, when he taught a young cousin how to convert kilograms to grams. With Khan's help, the cousin got good at math, and Khan launched a new career.


Now, Khan records his lessons from a converted closet in the back of his bedroom. He never goes on camera.


"It kind of feels like my voice in their head. You're looking at it and feels like someone's over your shoulder talking in your ear, as opposed to someone at the blackboard, that's distant from you," he said.


When the all-girl Castilleja School in Palo Alto, California invited Khan to speak in person - he immediately connected to the students there.


The concept of short lessons that can be played over and over again attracted high school senior Bridget Meaney. She says she had trouble with seventh grade algebra 5. "I think the teachers are good, but they can't go at a pace that's perfect for everyone," she said. "But I like the concept of knowing something in class but then going back and pressing pause or rewind and actually getting a deeper understand of it."


Originally, Khan kept his lessons short because of YouTube restrictions 6. Now, he thinks short is better.


"I've gotten researchers  telling me that you don't realize 10 minutes [we've done studies] is how long someone can have a high level of concentration. And anything beyond that you kind of lose it. I think that we've all had that experience sitting in college where you can be with the professor for about 10 or 15 minutes and then you kind of lose it," he said.


For Khan, teaching math, science, and finance is just the beginning. He says he's ready to expand his YouTube site to include other subjects as well.

 



n.分析家,化验员;心理分析学家
  • What can you contribute to the position of a market analyst?你有什么技能可有助于市场分析员的职务?
  • The analyst is required to interpolate values between standards.分析人员需要在这些标准中插入一些值。
adj.未付款的,无报酬的
  • Doctors work excessive unpaid overtime.医生过度加班却无报酬。
  • He's doing a month's unpaid work experience with an engineering firm.他正在一家工程公司无偿工作一个月以获得工作经验。
n.微积分;结石
  • This is a problem where calculus won't help at all.对于这一题,微积分一点也用不上。
  • After studying differential calculus you will be able to solve these mathematical problems.学了微积分之后,你们就能够解这些数学题了。
n.硅(旧名矽)
  • This company pioneered the use of silicon chip.这家公司开创了使用硅片的方法。
  • A chip is a piece of silicon about the size of a postage stamp.芯片就是一枚邮票大小的硅片。
n.代数学
  • He was not good at algebra in middle school.他中学时不擅长代数。
  • The boy can't figure out the algebra problems.这个男孩做不出这道代数题。
约束( restriction的名词复数 ); 管制; 制约因素; 带限制性的条件(或规则)
  • I found the restrictions irksome. 我对那些限制感到很烦。
  • a snaggle of restrictions 杂乱无章的种种限制
学英语单词
.mv
alignment hole
alkylferrocene
all-weld bridge
antipress
atrex
autonomous function
bordure
budell
chastizement
colores
colour television mask
compact disk-interactive
cribrous
cross-river buoy
crossed roller chains
dangerous pile
dannys
deep search
deoppilated
differential liberation
diffusion-reflection
divisionalizations
dumasia cordifolia benth et. backer
effective gas-oil ratio
eggs benedicts
erosional basin
fabii
falls off the wagon
felting resistance
fenbutatin oxide
fuel tolerance
fur goods
genus Prosopis
glenlyon
hash brownie
heavyheartedly
high-altitudes
high-frequency test bay
hyperemia cardiac failure
increasing nutrient concentration
incremental frequence shift
interpols
jail-bird
jyllands-posten
kasts
Kenacort
less-polluting
line clinometer
linguistic semiotics
load-balancing
Luxemburgish
magnetomechanical ratio
manual slot
marginal cost and revenue
mean blade width
mixed banking system
moderately fine texture
motlanthe
multiple sequence operation
Niekerkshoop
nominal terms
noncowboy
order cycadaless
overshoulder
overspecific
packing cloth
pain in the rear
pardoning the bad is injuring the good
personal selling
pointwise finite
poke and pry
pouring reel
preclavus
profits by
protestant church music
put under one's belt
rainmaker remover nozzle
reachability graph
reflex receiver
Resykin
river-marine vessel
root crops
scalene right triangle
scheduling resource
sima rock
simultaneousequation model
square-wave pulse of light
superfine grain developer
synangium
Tabakerz
taxing power
Ticonal
totally enclosed type motor
Trailliaedoxa
true yeasts
trypots
unscroll
USMA
water proofing material
xanthan
yang jin