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  • [时差N小时] 时差N小时:为何会形成黑眼圈? Why Do Dark Circles Form Unde

    也许你的确需要多睡一会儿,尽管有着普遍的误解,但眼周或眼底的黑眼圈和浮肿似乎与睡眠不足没有太大的关系

    2014-02-25 编辑:mike

  • [SAT写作辅导] SAT写作高分句型模板

      下面为大家整理和推荐的是SAT写作高分的句型总结,都是以实际的例句形式呈现的。大家在备考SAT写作考试的时候,多掌握一些句型类的模板是非常有效果的,对于提高写作的速度节省时间非常有效。大家一起来看看详细

    2012-06-13 编辑:echo

  • [SAT写作辅导] SAT考场如何形成写作思路?

      SAT写作考试的时间非常紧张,考生需要在最多3分钟的时间内形成自己的写作思路和写作大纲。那么我们如何练习才能在考场上达到这样的一个程度呢?下面天道小编就为大家整理了关于SAT写作思路的练习方法,希望对大家

    2012-06-13 编辑:echo

  • [探索发现] 宇宙的形成:大爆炸(16)

    So whether the universe end with a big crunch, our reverse of the Big Bang, or was it end by expanding out and becoming cold and dark. If you wish, would it end in fire or ice or with a bang or a wip

    2012-06-04 编辑:melody

  • [探索发现] 宇宙的形成:大爆炸(15)

    In the 14 billion years since the Big Bang, galaxies have been created, filled with stars, planets, and moons, and the universe has been expanding the whole time.大爆炸以后的140亿年里,包罗万象的星河

    2012-05-31 编辑:melody

  • [探索发现] 宇宙的形成:大爆炸(14)

    These the fluctuations would grow to form galaxies. So if it wasn't for those little density fluctuations, you and I would not be here today.物质分布的密度不断涨落,范围逐渐扩大,最后形成星系

    2012-05-30 编辑:melody

  • [探索发现] 宇宙的形成:大爆炸(13)

    It was in fact the moment of creation, nearly 14 billion years ago when those first atoms got their electrons. That's the moment when the milky cloud clears and the new universe comes into vi

    2012-05-29 编辑:melody

  • [探索发现] 宇宙的形成:大爆炸(12)

    The first one to form is Hydrogen. Then, over the next 3 minutes the Universe begins to create two more elements, helium and lithium.We went from a Universe that was infinitely small to a Universe th

    2012-05-28 编辑:melody

  • [探索发现] 宇宙的形成:大爆炸(11)

    The universe with equal amounts of matter and anti-matters, equivalent to the universe with no matter at all, because the matter and anti-matter will annihilate back into pure radiation, and with not

    2012-05-25 编辑:melody

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