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Society is changing rapidly. As a result, more and more people are suffering from stress. Those who are stressed out are often nervous, angry or ill. People must, therefore, learn to deal with this

发表于:2018-12-08 / 阅读(380) / 评论(0)

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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. After water, tea is the world's most popular drink. Now three New York City high school students have discovered what maybe a bruing scandal because th

发表于:2018-12-24 / 阅读(77) / 评论(0)

Scientific American(七)月

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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. The heart-stopping news from Stockholm is that the heart never stopsgrowing, that is. Because researchers have shown that the human heart continues to pr

发表于:2019-01-08 / 阅读(51) / 评论(0)

Scientific American(四)月

VOA标准英语2013--Students Invent Water Purification Disc

Students Invent Water Purification Disc The lab operates like a kitchen. They add several ingredients. Then they mix, weigh, press and bake them. What's created is called a MadiDrop - a ceramic disc infused with silver. When dropped in water, silver

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发表于:2019-01-31 / 阅读(56) / 评论(0)

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发表于:2019-02-09 / 阅读(71) / 评论(0)

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学英语单词

3-methoxypropene

a bolt out of the blue

be unlikely but not impossible

bee veil

bilaterally