单词：embryotrophic theory of menstruation
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23.Theory and Practice When talking about the importance of theory and practice,some people think theory is rather empty and abstract,so we should try to pratice a lot to obtain our goals;while others maintain that practice is rather too blind and wh
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生活半对半[The 50-Percent Theory of Life] I believe in the 50-percent theory. Half the time things are better than normal; the other half, they are worse. I believe life is a pendulum swing. It takes time and experience to understand what normal
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The Aldens followed the bike path through North Ridge Park on their way home from Cals house. The trees sheltered them from the wind, so it was easier pedaling here. The bike path became a narrow dirt trail through the thickest part of the woods and
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[00:08.59]Great scientists [00:12.25]John snow defeats king cholera [00:19.38]John snow was a well-known doctor in London--- [00:25.42]so famous, indeed, that he attended queen Victoria to ease the birth of her babies. [00:33.46]But he became inspire
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By Jessica Berman Washington 03 August 2007 There's a period in the development of toddlers when they seem to learn a new word every day. There are different theories about why young children undergo what experts call a word spurt. But one psychologi
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By Carol Pearson Washington 25 May 2007 Women who do not want children, and those who do, are both getting new help. The U.S. government has approved a birth control pill that eliminates menstrual cycles, and it also has approved a product to help wo
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There's been a lot of conversation revolving around tampons lately. Their material components have been brought under scrutiny, and the negative environmental impact of the disposal of plastic applicators have been the subject of many-a-discussion. E
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Since the April 20 explosion and fire that sank the BP Deepwater Horizon off-shore oil rig, about 800,000 liters of crude oil a day have been spewing from the broken well into the Gulf of Mexico. The massive spill is threatening marine life, commerci
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They may be the victims of unwanted sexual advances. And unfortunately, very, very often it might come even from their teachers. When boys and girls reach puberty, their bodies go through many physical changes. But for girls in Africa, the onset of m
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Pre-Listening Vocabulary blemish: an imperfection; a small flaw fade: to become less bright reincarnation: the belief that living beings die and then are reborn in a new form spear: a long sharp weapon that punctures the skin The Birthmark Theory Bir
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我们今天一起来看看白洁最喜欢的电视剧之一！Big Bang Theory! 生活大爆炸! 我们一起来学6季17集的美语说法！ 1) How'd it go? 过得怎么样？2) Body language 身势语。如果你能看出某人有什么感觉，那就
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