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压力大血压高

Ever feel like you are working in a pressure cooker ? Scientists find this week that job stress and strain can indeed make your heart work overtime. A medical survey of 8, 000 white-collar workers fin

发表于:2018-12-11 / 阅读(82) / 评论(0)

万花筒2006年

SSS 2008-03-28

This is Scientific American's 60-Second Science. Im Cynthia Graber. This will just take a minute. One of the problems with large-scale solar power plants is that they require a huge amount of space. To rise above that problem Israeli researchers rece

发表于:2018-12-24 / 阅读(95) / 评论(0)

Scientific American(三)月

2006年VOA标准英语-Space Station Spreads Its New Solar Wings

By David McAlary Washington 14 September 2006 The International Space Station has spread a new pair of golden wings. They are solar panels that will double the amount of power available to the outpost. Unfurling them took longer than expected becaus

发表于:2019-01-07 / 阅读(149) / 评论(0)

2006年VOA标准英语（九月）

美国科学60秒 SSS 2015-04-15

Early warning systems can be the difference between life and death in earthquake-prone regions. But they are expensive. The US, Mexico and Japan have such systems. That leaves large swats of central and South America, Asia and the Caribbean unprotect

发表于:2019-01-20 / 阅读(73) / 评论(0)

2015年Scientific American(四)月

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