单词:quiescent layer
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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
Once upon a time, if you planned on splashing water around in a decorative manner, you were expected to provide a basin in which the water could be collected afterward. In a long history reaching back to the Rome Empire, fountains had always had basi
181. Preparing for the pyramids准备探索金字塔 purge-quilt As an Egyptologist, I have been to Egypt many times. This time, I am going to quench my thirst for adventure and try to solve the puzzle of the Pyramids. To undertake such a questionabl
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
From time to time certain strains of virus return. 有几种病毒不时重复出现。 A disagreeable Russian virus known as H1N1 caused severe outbreaks over wide areas in 1933, then again in the 1950s, and yet again in the 1970s. 一种名叫H1N1的
Inflation has behaved strangely over the past decade. 在过去的十年中,通胀表现得很陌生。 The recession that followed the financial crisis of 2007-08 sent American unemployment soaring to 10%. 2007-08年金融危机之后的衰退曾令