单词：acetone pyrolysis
[化] 丙酮热解
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Simple New Test Detects Early Signs of Diabetes 新型简单测试或能检测出糖尿病早期迹象 People with Type 1 diabetes, usually diagnosed in children and young adults, must take insulin injections and watch their diet to keep their blood
发表于:2018-12-16 / 阅读(117) / 评论(0)
VOA标准英语2015年(一月)
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Air pollution outside is easy to spot, hanging over the city, or sputtering from a tailpipe. But there's lot of indoor air pollution, too, even if it's not as obvious. It's caused by volatile organic compounds, or VOCs. They can come from building ma
发表于:2018-12-24 / 阅读(156) / 评论(0)
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This is Scientific Americans 60-Second Science. Im Steve Mirsky. Got a minute? To keep your car purring, you have to change the oil. Such maintenance produces eight billion gallons of used motor oil annually. Some waste oil does get re-refined to pro
发表于:2018-12-24 / 阅读(150) / 评论(0)
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