单级放大

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(126) / 评论(0) 分类 美丽新世界

[00:00.00]Unit 2 COME TO MY HOUSE [00:17.40]unit 2 page 10 Listen, sing and act. [00:24.66]LET'S HAVE FUN [01:47.42]unit 2 page 10 PIGGY BANK: [01:54.39]cook eat play [02:20.25]unit 2 page 11 Listen,say and act. [02:31.61]come to my house,come to day

发表于:2018-12-13 / 阅读(243) / 评论(0) 分类 广州小学教科书口语第二册

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(129) / 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(149) / 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(186) / 评论(0) 分类 2015年Scientific American(一)月

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(149) / 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(142) / 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(144) / 评论(0) 分类 Scientific American(三)月

Words in unit 3 [00:03.77]第三单元的单词 [00:07.55]school [00:08.31]学校 [00:09.06]classroom [00:09.82]教室 [00:10.58]library [00:11.39]图书馆 [00:12.20]borrow... [00:12.88](向某人、从某处)借 [00:13.56]make [00:14.39]做;制

发表于:2019-01-09 / 阅读(254) / 评论(0) 分类 人教版小学英语五年级

Words in unit 6 [00:04.02]第六单元的单词 [00:08.05]fever [00:09.00]发烧 [00:09.95]stomachache [00:10.74]胃痛 [00:11.52]headache [00:12.32]头痛 [00:13.11]toothache [00:13.57]牙疼 [00:14.03]cough [00:14.81]咳嗽 [00:15.60]problem [00:16

发表于:2019-01-09 / 阅读(238) / 评论(0) 分类 人教版小学英语五年级

[ti:UNIT 2 Colours and Clothes Lesson 16: Unit Review] [00:00.86]UNIT 2 第二单元 [00:02.65]Colours and Clothes 颜色和衣服 [00:06.62]Lesson 16: 第16课: [00:08.53]Unit Review 单元复习 [00:11.44]Ⅲ. [00:13.24]Listening and Speaking 听一

发表于:2019-01-09 / 阅读(265) / 评论(0) 分类 河北教育初中英语(初中起点)七年级上

[ti:UNIT 6 Let's Go! Lesson 48: Unit Review] [00:01.53]UNIT 6 第六单元 [00:03.33]Let's Go! 我们出发吧! [00:05.57]Lesson 48: 第48课: [00:07.23]Unit Review 单元复习 [00:09.79]Ⅲ. [00:11.24]Listening and Speaking 听一听,说一说

发表于:2019-01-09 / 阅读(307) / 评论(0) 分类 河北教育初中英语(初中起点)七年级上

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(191) / 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(164) / 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(113) / 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(126) / 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(191) / 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(165) / 评论(0) 分类 VOA常速英语2007年(十一月)

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(190) / 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(162) / 评论(0) 分类 双语有声阅读
学英语单词
a man of figure
ablative protection
accountant and secretary
accst
Aitken,William Maxwell
alismal
alloy-like hydride
ashlin
associated commercial vehicle
Axonolaimoidea
Basingen
bismarsen
bisseuil
bissinger
boer goat
bottoming reamer
Buiter
bulk cargo ship
buquineran
casual shoes
ccrcs
centimeter wave
chases away
communicatees
conferent
congenital rickets
Cordillo Downs
coxii
creances
de-miners
density class
DHP
diesel engine starting test
dispersion-and-mask method
Doagh
electro-hydraulic forming machine
electron migration
eminelntia trigemini
euresol
fenchyl alcohol
fire retarding agent
foot length
format recognition
gathering main roadway
geothelphusa ilan
get sb in
Global offering
gray rami communicans
gum check
Hamilton, Mt.
Helvidian
hydrostatic non-contact bearing
in troubler
intersync mode
iodoformogen
Kambohs
kinges
Korgom
Laasgoray
Lambeosaurus
Lapotkovo
laser tool
Macedonian language
mammology
measure of information
microtwinning
midecacine
modulator-demodulator (modem)
natalino
navigation certificate
newly formed trust
oil mill
oxycamphor
palaeomeridian
Pelet'ma
phenylallyl alcohol
photoluminescence powder
pleni-tide
recp
reverberatory burning
rigourously
rocked up
sales presentations
scission
secondary deficiency
shore based management
six-square
sobbingly
star cut
starboard forward
sun drawing water
superclass Chelicerata
taitang county cultural center
throw over
tunnard
underbead crack susceptibility
vanadyl(iii) bromide
voicecast
wheel ore
wool comber
zaborski