One afternoon while I was in the middle of my favorite TV show, I heard my mother calling me in the kitchen. I got up from the sofa reluctantly and went to see what was going on. She was baking a cake and had just run out of sugar, so she wanted me t

发表于:2018-11-30 / 阅读(140) / 评论(0) 分类 常春藤生活英语

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发表于:2018-12-04 / 阅读(54) / 评论(0) 分类 英语四级听力练习集锦

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发表于:2018-12-04 / 阅读(55) / 评论(0) 分类 英语四级听力练习集锦

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发表于:2018-12-04 / 阅读(59) / 评论(0) 分类 英语四级听力练习集锦

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发表于:2018-12-04 / 阅读(51) / 评论(0) 分类 英语四级听力练习集锦

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发表于:2018-12-30 / 阅读(78) / 评论(0) 分类 单词解析速记

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发表于:2018-12-30 / 阅读(77) / 评论(0) 分类 单词解析速记

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发表于:2018-12-30 / 阅读(79) / 评论(0) 分类 单词解析速记

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发表于:2018-12-30 / 阅读(141) / 评论(0) 分类 单词解析速记

Its a stunning location, but its also mysterious. These stars are not just close together. They are on the move at enormous speeds. Going to the heart of a galaxy might not be the similar to going to an amusement park. The rides are some similar to h

发表于:2019-01-22 / 阅读(217) / 评论(0) 分类 自然百科2011年

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

发表于:2019-01-22 / 阅读(58) / 评论(0) 分类 自然百科2011年

The glowing region is the accretion disc, star debris falling inward, would turn round in the maelstrom heated by frictions to such high temperatures that it glows white hot. So at the center of our galaxy, we do have a black hole. We now know that t

发表于:2019-01-22 / 阅读(50) / 评论(0) 分类 自然百科2011年

Like nebulae which spawn stars, it is made of gas and dust. But that's where most similarities end. For Alex Filippenko, it represents an intriguing industrial zone within our galaxy where the elements from which our world is made or manufactured. Wh

发表于:2019-01-22 / 阅读(59) / 评论(0) 分类 自然百科2011年

We are taking a ride through the Milky Way. First, we are traveling to a place where stars are born. Even at the speed of light, 196,000 miles a second, the journey lasts for 1,500 years. We've arrived at the vast glowing cloud of gas and dust, the g

发表于:2019-01-22 / 阅读(67) / 评论(0) 分类 自然百科2011年

Like nebulae which spawn stars, it is made of gas and dust. But that's where most similarities end. For Alex Filippenko, it represents an intriguing industrial zone within our galaxy where the elements from which our world is made or manufactured. Wh

发表于:2019-01-22 / 阅读(82) / 评论(0) 分类 自然百科2011年

We are at a foundry here, and they are pouring molten iron from all machinery. And they are going to make parts for new machines out of that iron, so they are recycling yet, but all that iron was created and ejected into the cosmos by gigantic stars

发表于:2019-01-22 / 阅读(75) / 评论(0) 分类 自然百科2011年

In about four or five billion years, it will grow into a much bigger star, a star called a red giant. And that outer atmosphere of gases will be held so loosely by the sun at that time that the gases will be blown away gently in what I call a cosmic

发表于:2019-01-22 / 阅读(70) / 评论(0) 分类 自然百科2011年

By Anya Ardayeva Moscow 16 January 2007 watch Pipeline report Belarus/Russia pipeline Russia has resumed pumping crude oil to Western Europe through Belarus, after shutting down a pipeline for three days amid charges that authorities in Minsk were il

发表于:2019-02-04 / 阅读(107) / 评论(0) 分类 2007年VOA标准英语(一月)

By Claudia Blume Hong Kong 02 April 2007 From Bombay to Beijing, a newly affluent Asian middle class is increasingly adapting Western lifestyles. Many city dwellers opt for high calorie fast food instead of healthier traditional meals and are becomin

发表于:2019-02-05 / 阅读(275) / 评论(0) 分类 2007年VOA标准英语(四月)