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单词：danlayer 相关文章
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
发表于:2018-12-29 / 阅读(312) / 评论(0)
英语课程学习计划和讲义
英语课程学习计划和讲义
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
发表于:2019-01-21 / 阅读(265) / 评论(0)
纯正英语一分钟
纯正英语一分钟