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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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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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中文 英文 缩写 单（点）播 unicast 单板 board/card 单边测试 one-sided test 单边带 Single Side Band SSB 单边带调制 single sideband modulation 单边带自适应差分 single ban
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When the new men's world tennis rankings come out next week, Mardy Fish will be the highest ranked American on the list. He has reached this milestone in his tennis career, remarkably, at the age of 29. With his 7-5, 6-2 win late Wednesday at the Son
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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
纯正英语一分钟
-You always ask me difficult questions. -Well, that's my job. -Well, this does at least tell us somebody comes from Northern Europe here with this material in quite considerable amounts. -Well, somebody may not have come. Somebody may have been handi
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