单词：Geissler pump
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I first heard about the ozone layer about twenty years ago. I was still in school. I thought it was interesting, but I didnt take it seriously. It was a bit like science fiction, I mean, how could there be a giant hole in the atmosphere? Over the yea
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Healing Elbows And Eyeballs A scratch to the surface of your eye heals quite rapidly, often in a matter of minutes. But a surface scratch on your elbow takes days rather than minutes to heal. The reason for these different rates of healing is directl
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There is a special day to recognize the importance of the ozone layer. In 1995, the United Nations General Assembly decided September 16th is the International Day for the Preservation of the Ozone Layer. This is the date on which countries signed th
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I first heard about the ozone layer about twenty years ago. I was still in school. I thought it was interesting, but I didnt take it seriously. It was a bit like science fiction, I mean, how could there be a giant hole in the atmosphere? Over the yea
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What Are Calluses And How Are They Formed? 皮肤上的茧是如何形成的？ 人体皮肤由于劳动过程长期摩擦造成皮肤表皮细胞坏死而形成的，主要出现于手掌、足掌等部位。长时间的受到磨檫,组织细胞的老
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