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The rock called sandstone is made up of a great many grains of sand. The beating of the rain on this rock washes the grains apart, and so the hard sandstone slowly changes into loose sand. 砂岩主要由大量沙粒组成。当雨水打下来的时候
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AGRICULTURE REPORT - Building a Rooftop Vegetable Garden By Bob Bowen Broadcast: Tuesday, September 21, 2004 This is Gwen Outen with the VOA Special English Agriculture Report. Who says people need la
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When we think of waste, we dont usually think utility. Yet, as we face droughts, limited landfill space, and depleting natural resources, weve been forced to reconsider our castoffs, with interesting results. These five case studies show that with in
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