棉花田 Cotton Field 英文歌词 When I was a little bitty baby, My mama would rock me in the cradle, In them old cotton field back home. It was down in Louisiana, Just about a mile from Texarkana, In them old cotton field back home. And when them

发表于:2018-11-29 / 阅读(133) / 评论(0) 分类 99首适合练习听力的英文歌

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发表于:2018-12-05 / 阅读(92) / 评论(0) 分类 苏格兰玛丽女王.Mary.Queen.Of.Scots

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发表于:2018-12-06 / 阅读(85) / 评论(0) 分类 简·爱.Jane.Eyre

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发表于:2018-12-06 / 阅读(106) / 评论(0) 分类 简·爱.Jane.Eyre

SCOTT SIMON, HOST: Baseball's a game that honors tradition, like B.J. Leiderman, who writes our theme music. At Wrigley Field, which is where I believe the world champion Chicago Cubs play, that 103-year-old ballpark has a new seating and dining area

发表于:2019-01-16 / 阅读(66) / 评论(0) 分类 2017年NPR美国国家公共电台8月

MICHEL MARTIN, HOST: If you are a television fan, then you might know Anna Deavere Smith from her roles as the hippie grandmother on Black-ish, the hospital administrator in Nurse Jackie and the national security adviser on The West Wing. But she's a

发表于:2019-01-16 / 阅读(74) / 评论(0) 分类 2018年NPR美国国家公共电台3月

ARI SHAPIRO, HOST: The actor Lakeith Stanfield is having a moment. My co-host Audie Cornish recently sat down with him to talk about how he picks his projects and what's next. AUDIE CORNISH, BYLINE: Stanfield was in Jordan Peele's Oscar-winning horro

发表于:2019-01-17 / 阅读(130) / 评论(0) 分类 2018年NPR美国国家公共电台7月

The solar system is a hostile place. Earth is under attack from deadly cosmic radiation. Life here is only possible, because it's protected by the magnetosphere, an invisible force field that cocoons the planet. But new evidence reveals that this vit

发表于:2019-01-22 / 阅读(89) / 评论(0) 分类 自然百科2011年

Radiation causes damage at the most fundamental level. It mutates the blueprint of life, DNA. Earth's magnetosphere is our crucial defense. It's so fundamental to our evolution and continued existence that the race is on to understand why it's changi

发表于:2019-01-22 / 阅读(85) / 评论(0) 分类 自然百科2011年

Earth's magnetic field has reversed thousands of times since its formation 4.5 billion years ago. And scientists now believe that the next reversal is imminent. The race is on to predicting exactly when it will occur. In 2010, the European Space Agen

发表于:2019-01-22 / 阅读(66) / 评论(0) 分类 自然百科2011年

As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get increasingly close to the Earth's surface. As the reversal approaches, the decay of our magnetic field will continue and cosmic radiation will get

发表于:2019-01-22 / 阅读(89) / 评论(0) 分类 自然百科2011年

Glatsmire's model shows that the magnetic poles swap places spontaneously due to / complex processes within the core. We were used to the idea that a compass points somewhere near the North Pole and hence we can use it for navigation, but there are p

发表于:2019-01-22 / 阅读(80) / 评论(0) 分类 自然百科2011年

By analyzing thousands of lava samples, geophysicists discover/ that the Earth's magnetic field has reversed over 18,000 times in the last 20 million years. On either side of these reversals is a long period of dramatically reduced field strength. Du

发表于:2019-01-22 / 阅读(78) / 评论(0) 分类 自然百科2011年

We drive them about 20 miles away to the North, and release them, and we track them as they try to fly back home. We drive them about 20 miles away to the North, and release them, and we track them as they try to fly back home. Hes up, OK. Holland wa

发表于:2019-01-22 / 阅读(89) / 评论(0) 分类 自然百科2011年

By analyzing different samples of lava, Herrero / Bervera has built up a picture of how the filed has changed since long before humans were around. They are actually the recorders of the Earth's magnetic field in hundreds of years, thousands of years

发表于:2019-01-22 / 阅读(89) / 评论(0) 分类 自然百科2011年

In polar regions where the magnetic field is / weakest, auroras glow in the sky. These dazzling displays of colored lights form when solar particles slam into gases in our atmosphere causing them to glow. The stronger the solar wind, the more dramati

发表于:2019-01-22 / 阅读(94) / 评论(0) 分类 自然百科2011年

It's clear from the fact that the Martian crust is strongly magnetized, that there must have been a magnetic field on Mars in the past, that the only way we know to magnetize rocks is for them to form in the presence of magnetic field. Why did Mars l

发表于:2019-01-22 / 阅读(81) / 评论(0) 分类 自然百科2011年

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

发表于:2019-01-22 / 阅读(100) / 评论(0) 分类 自然百科2011年

Blockson's computer model reveals that at the South Atlantic Anomaly, the magnetic field isn't just weaker than anywhere else on the planet. It's actually reversed polarity. There is a patch on the core in the South Atlantic where things are not poin

发表于:2019-01-22 / 阅读(93) / 评论(0) 分类 自然百科2011年

Jack and Annie walked with the soldiers into the camp. Outside one tent was a long line of men in torn blue uniforms. They looked tired and hurt. Many were bloody and barely ableto stand. Women wearing dark dresses were giving out food and waterto th

发表于:2019-02-17 / 阅读(102) / 评论(0) 分类 汪培珽儿童英文分级书单《神奇树屋》