增益放大

Splendid! He kept his telescopic cameras carefully aimedglued to their moving objective; 精彩片他小心地调着望远摄影机的镜头,盯紧了那移动着的对象。 clapped on a higher power to get a close-up of the frantic and distorted

发表于:2018-12-07 / 阅读(79) / 评论(0) 分类 美丽新世界

Rachel: What does John do for a living? Derek : He's a salesman. Rachel: That's a difficult way to make a living. Derek: Well, remember: No pain, no gain. 一分耕耘,一分收获 雷切尔:约翰是靠什么谋生的? 德里克:他是个推销员

发表于:2018-12-08 / 阅读(352) / 评论(0) 分类 赖世雄初级美国英语

EXPLORATIONS - The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can

发表于:2018-12-16 / 阅读(76) / 评论(0) 分类 2013年VOA慢速英语(二)月

BBC News with Julia Candler. A senior member of North Koreas government has warned that his country would react with a pre-emptive nuclear strike if it saw signs that the US was preparing to launch an attack. Speaking to the BBC, the Vice Foreign Min

发表于:2018-12-20 / 阅读(71) / 评论(0) 分类 中英双语新闻

This is Scientific American's 60s Science. I'm Karen Hopkin. This will just take a minute. Think about the tools used by biologists, perhaps test tubes and microscopes come to mind. But what about diapers? No, it's not the investigators in their work

发表于:2018-12-24 / 阅读(61) / 评论(0) 分类 2015年Scientific American(一)月

Rachel: What does John do for a living? 雷切尔:约翰是靠什么谋生的? Derek: Hes a salesman. 德里克:他是个推销员。 Rachel: Thats a difficult way to make a living. 雷切尔:以那种方式谋生是很困难的。 Derek: Wel

发表于:2018-12-26 / 阅读(54) / 评论(0) 分类 天天练口语

In my lab, we recently made a cancer nanodetector 在我的实验室,我们最近研制出了一种癌症纳米检测器, that is so small that it could travel into the body and look for tumors. 小到可以进入全身血液循环并寻找肿瘤。

发表于:2019-01-03 / 阅读(85) / 评论(0) 分类 TED演讲科学篇

PCRthe polymerase chain reactionis a crucial tool. The DNA amplification technique is used in genome sequencing, forensics and the diagnosis of various diseases. To give researchers more genetic material to work with, a PCR instrument repeatedly heat

发表于:2019-01-08 / 阅读(72) / 评论(0) 分类 Scientific American(十)月

This is Scientific American 60 Second Science, I am Karen Hopkin, this will just take a minute. Every year, about 10 million tons of paper winds up in American landfills and incinerators, which is not only wasteful but adds CO2 to the atmosphere. Rec

发表于:2019-01-08 / 阅读(89) / 评论(0) 分类 Scientific American(三)月

The History of the Laser Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can go from the sci

发表于:2019-01-12 / 阅读(121) / 评论(0) 分类 2013年VOA慢速英语(五)月

EXPLORATIONS - The Laser: Futuristic Science Found at Your Local Store MARIO RITTER: Welcome to EXPLORATIONS in VOA Special English.Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one

发表于:2019-01-12 / 阅读(87) / 评论(0) 分类 2012年VOA慢速英语(一)月

'Word on Street' Impacted Language in 2011 While 2011 is over, some of the words that came to define the past year are still very much with us, and may be for years to come. Since 2011 was an especially busy year for grassroots political action, many

发表于:2019-01-13 / 阅读(63) / 评论(0) 分类 VOA标准英语2012年(一月)

Because of course, the ear is, I mean, subject to all sorts of things. 这当然是因为,我是说,耳朵受制于很多因素。 The room we happen to be in, the amplification, the quality of the instrument,the type of sticks...etc., etc. 我们现

发表于:2019-01-18 / 阅读(67) / 评论(0) 分类 TED演讲国际问题篇

Welcome to EXPLORATIONS in VOA Special English. Im Mario Ritter. This week, we tell about one of the most recognizable objects in science fiction the laser. It is one of the best examples of how technology can go from the science of the future to eve

发表于:2019-01-24 / 阅读(115) / 评论(0) 分类 英语语言学习

By Paul Sisco Washington 14 November 2007 At the McDonald Observatory in western Texas, a unique space program has been quietly underway for more than 30 years. It is called the Lunar Laser Ranging Program. VOA's Paul Sisco has more. Research scienti

发表于:2019-01-31 / 阅读(105) / 评论(0) 分类 VOA常速英语2007年(十一月)

今天我们要学的词是to gain traction。 To gain traction, 是越来越受欢迎的意思。 The idea of becoming an entrepreneur is gaining traction among the youth in China, 在中国,越来越多的年轻人开始走自己创业的道路。

发表于:2019-02-07 / 阅读(73) / 评论(0) 分类 英语每日一词

今天我们要学的词是gain ground。 To gain ground意思是有进展,也可以指越来越被大家所接受。Mild weather helped firefighters gain ground on a fire in Yosemite National Park, 温和的天气让消防队员征服优胜美地国

发表于:2019-02-07 / 阅读(77) / 评论(0) 分类 英语每日一词

By Laura Adams. This episode is about the advantages and disadvantages of investing in mutual funds. Taxes on Top of Losses As we all know, many people have lost investment money due to the stock market volatility in recent weeks. Its been a tough ti

发表于:2019-02-08 / 阅读(189) / 评论(0) 分类 货币英语

Nobel in Physics for Controlling Laser Light 诺贝尔物理学奖颁给激光控制实验者 The main practical application of CPA so far has been in the eye surgery. It was the first one, and I think it is the one that is used by the most people fo

发表于:2019-02-14 / 阅读(68) / 评论(0) 分类 2018年科学美国人10月

The Revolution in American Higher Education To produce the upheaval in the United States that changed and modernized the domain of higher education from the mid 1860's to the mid 1880's, three primary causes interacted. The emergence of a half dozen

发表于:2019-02-25 / 阅读(94) / 评论(0) 分类 双语有声阅读
学英语单词
ale-bush
algorithmizability
antiboson
arabias
bansley
beren
Bososama
bulk outlet temperature
carbamyl esterase
catalytic ionization detector
cercidiphyllums
Chinese ortichoke
chirata
claire l.
coated rod
cooling water
couple in
craine
creping machine
cystidoceliotomy
double-precision number
double-seal bearing
duodeno-
ependyma ventriculorum
facebook.com
fall through the cracks
Fimbristylis subinclinata
Florida, State of
freight train formation plan
galium aparines
genus cacicuss
give sb a break
glueing
goal-scorers
hammer-head key
helicopter tail rotor
host resident software system
household arts
iconotheca
input output exchange
Iodistol
it is not always the case
kiski
knob control
Kuorpukas, Gora
l'impression
livestock farming
lucius annaeus senecas
lut
monozygotic twin
nomadising
not stand a ghost of a chance
one-dimensional defect
operator precedence case
otherguise
ovalites
Parkinson's mask
pas (para-aminosalicy lic acid)
pipewood
Polygonum thunbergii
potash fixation
preplasticizing
preponed
psychographist
public-record
purophosphorolysis
Qaraghandy
quintuple time
radmila
regards
regeneration column
resolution theorem proving
rimma
rockability
rolling bearing identification code
Sagbovi
salting stain
Santa Claus
scriptedness
silence period
simulation of data processing
South Region
spindle speed change
Sunda Trench
syndrome of wind-phlegm invading upward
tacts
technology process
to keep an ear to the ground
uncompensaing ring adaptor
undesirability
upper stage rocket engine
upper wind chart
Usharal
vendemiaires
verge ring
viewpoints frameworks
wait character logic
walleye pollack, walleyed pollack
whitehanded
X-ray fluoremetry logger
y/u/v
Z-buffer algorithm