发声器, 声音产生器

[00:04.00]flight [00:06.22]n.飞翔,飞行;航班;航程;楼梯的一段 [2]逃跑,溃退 [00:08.44]fling float flock [00:11.62]vt.(用力地)扔,抛,丢 v./n.漂浮,浮动 n.(禽,畜等的)群;大量v.群集,成群 [00:14.81]flood floor [0

发表于:2018-11-30 / 阅读(281) / 评论(0) 分类 考研英语词汇2005

When Pablo Panda Sandoval made history with 3 home runs in game one of the world series his head was probably buzzing. But when batters in chilly Detroit had the ball not quite right in the next couple of the nets, it will be their hands that buzzing

发表于:2018-12-24 / 阅读(124) / 评论(0) 分类 Scientific American(十)月

This is Scientific American's 60-second Science. I'm Steve Mirsky. Got a minute? Can you name those notes? Probably not. Perhaps one in ten thousand speakers of European languages has perfect pitch - the ability to recognize a note without having hea

发表于:2018-12-24 / 阅读(146) / 评论(0) 分类 Scientific American(五)月

This is Scientific American's 60-second Science. I'm Karen Hopkin. If you ever got picked on in the schoolyard, you might have wished for some sort of superpower, like unbeatable speed or maybe just the ability to completely disappear. Now scientists

发表于:2018-12-24 / 阅读(144) / 评论(0) 分类 Scientific American(五)月

Scientists analyzed around 2,500 of those calls, and found that the second part (sound) is nearly identical in pitch every time from each whale: 16 hertz, or four octaves below middle C. And the slight variations in frequency that do exist are only a

发表于:2019-01-02 / 阅读(167) / 评论(0) 分类 60秒科学

Hybrid cars are good for the environment. But scientists say that they might be bad for pedestrians. Because hybrids are so quiet, it can be hard for walkers to hear them until its too late. Listen to this. [quiet car sound] Thats a Toyota Prius mov

发表于:2019-01-02 / 阅读(196) / 评论(0) 分类 60秒科学

Can you name those notes? Probably notperhaps one in 10,000 speakers of European languages has perfect pitch, the ability to recognize a note without having heard any reference note first. But theres a much better chance you could successfully name

发表于:2019-01-02 / 阅读(162) / 评论(0) 分类 60秒科学

If you ever got picked on in the schoolyard, you might have wished for some sort of superpower: like unbeatable speed or maybe just the ability to completely disappear. Now scientists at the College of Wooster in Ohio say that you might have had a s

发表于:2019-01-02 / 阅读(201) / 评论(0) 分类 60秒科学

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Every year, scores of manatees are killed by boats in Floridas waters. Their plight is an ecological concern. And everyone from marine biologists to Marg

发表于:2019-01-08 / 阅读(140) / 评论(0) 分类 Scientific American(十一)月

This is Scientific American's 60-second Science. I'm Karen Hopkin. This will just take a minute. Hybrid cars are good for the environment, but scientists say that they might be bad for pedestrians. Because hybrids are so quiet that can be hard for wa

发表于:2019-01-08 / 阅读(147) / 评论(0) 分类 Scientific American(五)月

We humans are pretty good at communicating with sounds other than words. But how much of this is hard-wired, and how much do we pick up from others? To find out, researchers recorded the nonverbal sounds of people born deaf, as they responded to a ra

发表于:2019-01-08 / 阅读(191) / 评论(0) 分类 Scientific American(十一)月

Blue whales off the California coast make calls that, sped up 10 times, sound like (sound of two-part call). The original is a wall-rattling frequency too low for us to hear. Scientists analyzed around 2,500 of those calls, and found that the second

发表于:2019-01-08 / 阅读(125) / 评论(0) 分类 Scientific American(八)月

Bladeless Wind Generator Safe for Birds Wind turbines are tall structures with large blades used to produce electricity. They are useful sources of low-cost, renewable energy. But they can also be deadly to birds and bats. The turbines large blades t

发表于:2019-01-12 / 阅读(193) / 评论(0) 分类 2015年VOA慢速英语(七)月

Country Music Ladies Put Men in Their Place American country music lyrics often describe women as they might appear in mens dreams. This is especially true of songs by many male artists. But the songs by Maddie Marlow and Tae Dye are different. The t

发表于:2019-01-12 / 阅读(151) / 评论(0) 分类 2015年VOA慢速英语(九)月

Boston Symphony Makes Music in Mountains When Serge Koussevitzy, the Russian-born conductor of the Boston Symphony Orchestra, opened Tanglewood in 1937, he chose an all-Beethoven program, including the Pastorale Symphony. When conductor Christoph von

发表于:2019-01-13 / 阅读(126) / 评论(0) 分类 VOA标准英语2012年(七月)

By Alisha Ryu Nairobi 18 November 2009 A U.S.-flagged container ship which was hijacked by Somali pirates seven months ago has been attacked again off the coast of Somalia. Pirates were unsuccessful in their second attempt to hijack the Maersk Alaba

发表于:2019-01-14 / 阅读(166) / 评论(0) 分类 VOA标准英语2009年(十一月)

RAY SUAREZ, HOST: After Harvey and Irma, the hurricane season wasn't over. Hurricane Maria made landfall on Puerto Rico as a massive Category 4 storm. Months later, the power supply is still spotty, and thousands of homes still rely on generators. Da

发表于:2019-01-16 / 阅读(157) / 评论(0) 分类 2017年NPR美国国家公共电台12月

The Tiangong-2 space lab, though adopting the structure of Tiangong-1 without too many changes in appearance, has been designed to function much stronger than its predecessor. Zhu Congpeng, chief designer of the lab, says they've focused on a variety

发表于:2019-01-19 / 阅读(152) / 评论(0) 分类 2016CRI中国国际广播电台

JUDY WOODRUFF: Next: the possibilities of getting more energy through water. Humans have long harnessed the power of water to perform work. In modern time, hydroelectricity, generated by the power of water flowing through turbines at the base of dams

发表于:2019-01-27 / 阅读(184) / 评论(0) 分类 PBS访谈环境系列

通知与确认 Acknowledgments Confirmations 通知对方接到来信Acknowledging receipt of letters1. Dear Mr/Ms,Thank you for your letter No. A-3 of 6th May, offeringus 6 UI-4 Viewdatas. We have passed it on to ourTechnical Department for their c

发表于:2019-02-06 / 阅读(176) / 评论(0) 分类 实用英语
学英语单词
2-PDS
a monkey
administrative country
algebraic invariant
arsa
bachand
base defense operations center
biomas
biomimic material
blockag
blurts
bugbee
Cartaxo
cellulose microcrystalline
channel size
chickcharnies
cloggers
color synchronizing signal
combination cutting and loading machine
compare to
complexometry
crural ridge
Daghda
Damāvand, Rūdkhāneh-ye
Derrien's butter
dislodgements
drunken drive
dwam
emulsoid-gelatin tests
enalapril
enfranchisable
externalupset
fiduciarily
flat billet
frest
gainy
gear material
Glen Helen
Great Pyrenees
harbo(u)r boat
hibonites
ill-fortune
independent judgement
International Wool Secretariat
isochronal rhythm
j walking
Kasungan
kicked in
Kimjongilia
knowledge-based pay
lensia conoidea
local backup protection system
loss of gloss
Mandunyane
modified Newtonian equation
nephologists
nitrosalicylaldehyde
nonfusion
nonslippage
pad stamping machine
personnel agency
pirate label
polyiodides
polytropic change
Pomerantsev
poor peasants, fund
pressure relief cap screws
radio-safety signal
Raditsa-Krylovka
recording program
resonance wave
roller way control case
romanski
see good to do something
semiotically
sex-roler
sexualities
single-circuit transposition
Slope County
statically
subjoins
suckets
sulfinyl bromide
torispherical head
tracking controller
Trinectes maculatus
turpitudinous
uncle tomming
undosous
Utena
Venoy
virtual screen display
viviparism
wartworts
Whangarei
white-tipped sharks
windshield anti-icer
wirelessness
word number
wreck marking light
wriglesworth