单词:direct current excited iron core reactor
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This is Scientific American's 60-Second Science, I am Cynthia Graber.This'll just take a minute. On earth, snow crystals as we all know, form from frozen water. But scientists believe there're also flakes that fall on Mercury, and they're made of iro
By Naomi Schwarz Northern Mauritania 17 October 2007 In arid Mauritania, where Sahara desert meets Sahel grasslands, a train stretching up to two and one half kilometers snakes along the northern border. Built to carry iron ore from mines in the nort
This is Scientific Americans 60-Second Science. Im Karen Hopkin. This will just take a minute. Thars gold in them thar hillsand we may have meteorites to thank. Because it appears that a rain of meteors nearly 4 billion years ago peppered the Earths
All Risks 一切险 F.P.A. (Free from Particular Average) 平安险 W.A. / W.P.A (With Average or With Particular Average) 水渍险 War Risk 战争险 F.W.R.D. (Fresh Water Rain Damage) 淡水雨淋险 Risk of Intermixture and Contamination 混杂、玷
Strengthen Your Core With 5 Simple Exercises From VOA Learning English, this is the Health and Lifestyle report. Your core is a complex network of muscles. It includes your abdominal muscles, back muscles and the muscles around you pelvis. Basically,
Chernobyl Disaster Leads to Advances in Science, Medicine The accident at the Chernobyl nuclear plant did much more than change the lives of hundred thousands of affected people. It also contributed greatly to Western science. Physicists and medical
150-Year-Old US Capitol Dome Being Restored 150年历史的美国国会圆顶将被修复 WASHINGTON The U.S. Capitol Dome in Washington, DC, is recognized world-wide as one of the most enduring symbols of the U.S. government and American democracy.
Once theyve caught the light of a dying star with their state of our telescopes. The detective work can begin. We collect that light and we analyze it in great detail in order to determine whats going on, whats the chemical makeup of the star, whats
The loss of the magnetic field has a catastrophic impact on the planet's evolution. Mars becomes the red planet we see today. If earths magnetic protection continues to fade, would it suffer the same fate? If it vanishes completely, the planet might
Easily confused by this idea, there has a big thawed iron inner core, so that I think it's just the bar magnet, just permanent magnet frozen in nad, and that's where causes all the magnetic field. But it's too hot inside the Earth, that can't happen
Have you ever considered the possibility that the sun will eventually burn out? Don and Yael discuss that sobering thought on this Moment of Science. [OUTSIDE INSECT SOUNDS] D: Wow, what a beautiful s
By Stephanie Ho Washington 15 July 2007 U.S. National Security Advisor Stephen Hadley says Washington still has concerns about North Korea's nuclear program, despite Pyongyang's decision to shut down its main plutonium reprocessing facility. VOA's St
China's iron ore manufacturers say they're struggling to keep their businesses afloat because of high costs and taxes while production is on the rise for the sector's global giants. Brazil's Vale SA is the world's largest iron ore producer and it say
今天我们要学的词是hard-core。 Hard-core, 是指坚定的,铁杆的。Hard-core gamers, 是指打电玩上瘾的人。Hard-core members of the party, 是指一个政党的中坚力量。All my friends are hard-core Redskin fans, 我的朋友
今天我们要学的词是hard-core。 Hard-core, 是指坚定的,铁杆的。Hard-core gamers, 是指打电玩上瘾的人。Hard-core members of the party, 是指一个政党的中坚力量。All my friends are hard-core Redskin fans, 我的朋友
【英文原文】 Like all stars, the sun is basically a giant nuclear reactor that burns hydrogen to create energy. But like any reactor, the sun needs fuel to keep going. Its been going strong for around four-point-five billion years, and will pro
So Long, Sun 再见了,太阳 D: Wow! What a beautiful sunset. Y: Enjoy it while it lasts, the sun wont be around forever, you know. D: You mean, one day the sun will disappear? Y: Not exactly disappear, but the sun will eventually burn out and die