拒水性液体,斥水性液体

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The northeast just had its first big snow of the season. Meanwhile, on Titan, it was foggy. That weather report brought to you by researchers publishing in the journal Astrophysical Journal Letters. The scientists found that Titan, Saturns largest mo

发表于:2018-12-02 / 阅读(52) / 评论(0)

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SCIENCE IN THE NEWS - All About Fireflies and Possible Liquid Water on Mars CHRISTOPHER CRUISE: This is SCIENCE IN THE NEWS, in VOA Special English. Im Christopher Cruise. BOB DOUGHTY: And Im Bob Doughty. Today, we tell about evidence of liquid water

发表于:2018-12-07 / 阅读(67) / 评论(0)

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Lesson 27: [00:03.58]Let's Do an Experiment! [00:07.24]One Experiment,Two Theories [00:11.81]A theory is an idea.A theory predicts what will happen. [00:18.57]An experiment shows what happens. [00:23.25]BRIAN:Did you read about this experiment,Danny?

发表于:2018-12-13 / 阅读(135) / 评论(0)

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VOA慢速英语 2007 0521a

This is the VOA Special English Development Report. Dye can bring a little color to life. Most clothing is colored with dyes. Modern, manufactured dyes can be costly. Natural dyes from plant and animal products have been used since ancient times. So

发表于:2019-01-11 / 阅读(57) / 评论(0)

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发表于:2019-01-16 / 阅读(44) / 评论(0)

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建造屋顶花园

> 32 建造屋顶花园 DATE=6-5-01 TITLE=AGRICULTURE REPORT - Building Rooftop Gardens BYLINE=Bob Bowen （Start at 59

发表于:2019-01-30 / 阅读(139) / 评论(0)

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advisory circular (ac)