单词：carbon black mass strength
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Lesson 4 Black-lead 第四课 黑铅 What is the black-lead in your pencil made of? If you take a bit of the metal which we call lead, you will find that it is grey in colour, very heavy, and not at all like the black-lead in your pencil. But the lea
英国学生科学读本
This is Scientific American's 60-Second Science. I'm Amy Kraft. Got a minute? Out of control drivers aren't the only thing city cyclists have to worry about. New research suggests that cyclists are at increased risk of lung damage because of soot. A
Scientific American(九)月
导购口语: I'd like to see the Apple computers. Do you have? 我想看看那苹果公司生产的电脑，有吗？ My office needs two copy machines. 我办公室需要2台复印机。 Here's a list of the items I want for my office: two boxes of
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Topics: Famous Americans-Charles and Ray Eames; The Black Fives Leagues and The Negro Baseball Leagues; inner and outer versus inside and outside; severely versus seriously Words: architecture fellowship experimental design form fitting plywood splin
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A tornado rips across the Missouri Plains. Winds over 150 miles per hour shred everything in the twister's path. When it smashes a trailer home, one man is sucked into the heart of the storm, spun and shaken horrifically. His limp body drops out of
国家地理2008年
Those stars don't feel the black hole. They feel the rest of the stars in the galaxy. They don't know or care that the black hole is there. If you took the black hole away from the galaxy, they would
超大质量黑洞
Researchers: Many Black Holes in Center of Milky Way Galaxy Astronomers say the center of our galaxy has plenty of strange, super gravity objects. For years, scientists believed that circling the center of galaxies, including our own Milky Way galaxy
2018年VOA慢速英语(四)月
Two: Strength Training 减肥之二：力量训练 Strength training or resistance exercises use your existing muscular strength to improve muscle mass and burn fat. The result is more lean muscle mas
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ROBERT SIEGEL, HOST: James Forman Jr. may change the way you think about the mass incarceration of African-Americans on drug charges. Foreman is a law professor at Yale who used to be a public defender in Washington, D.C. He's also the son of a famou
2017年NPR美国国家公共电台4月
If you've gone shopping for a car lately, you might have noticed that fuel economythe number of miles per gallonis creeping up. One reason is a more efficient type of fuel injection, called gas direct injection. Its a feature of half the new cars sol
2016年Scientific American(八)月
In 2016 the Laser Interferometer Gravitational-Wave Observatory, LIGO, made the first accepted detection of gravitational waves. So any time you move a mass it produces a gravitational waveso black holes, like the ones LIGO detected, these are stella
2017年Scientific American(三)月
Each tag is whipping around the center of the galaxy, the particular, the most striking thing you will notice is the motion of SO2.So SO2 goes on an incredible roller-coaster ride. It comes whipping around and then back out. Something with tremendous
自然百科2011年
Soot was cause for a different concern in another recent study. Scientists with the American space agency, NASA, suggest it as a major cause of global warming. The study says the problem is how soot interacts with snow and ice. Snow and ice have high
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The X-ray image revealed how the black hole at the heart of the galaxy was firing unimaginable amounts of radiation into surrounding space and with extraordinary consequences. We could see what was going on at the centre and we could start to underst
探索与发现2013年
The super bright quasar phase having ended many billions of years ago, when the fuel that fires violent emissions was completely consumed. But now, with the approaching gas cloud and a prospect of feeding, the black hole should get brighter. Exactly
探索与发现2013年
Was there any connection between the two? What Magorian discovered was completed unexpected. The relationship that we find was essentially that the bigger the galaxy, the bigger the black hole. That's in its broad terms. If you want to be a bit more
探索与发现2013年
Island 唱片的新乐队(到现在也不算新了)Jet Black Stare以爆炸般的方式在电台中发布了他们在 Modern ROCK (现代摇滚) / Mainstream Rock (主流摇滚)乐风之路上的第一首单曲Ready To Roll,随后他们在08年7月15日
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本期内容： Couldchipfathelpdirtyshippingcleanupitsact? Theglobalshippingindustryisasbigacontributortogreenhousegasemissionsasaviation, andtheheavyfueloilthatpowersitsgiantvesselsisexceptionallydirty-packedwithsoot, blackcarbonandsulphur.InSeptem
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Topics: Famous Americans: Booker T. Washington; things Americans believe are lucky; horribly versus terribly versus awfully; full tuition reimbursement; carbon copy Words: freedmen peer activism accommodating desegregation historically black universi
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