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For those who can get here in summer, these waters provide a feast of epic proportions. But the good times will be very short, a problem that faces all life in the Polar Regions. Journeying the south across the Arctic Ocean, the first land you/ reach
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Cemento-enamel junction- the junction between the enamel covering the crown of the tooth and the cementum covering its root. Often referred to as the CEJ. Cementoblasts - cells of mesenchyme origin, i
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Nerve growth factor- a cytokine that promotes the growth and repair of sensory nerves and maintenance of sympathetic nerves. Neural crest cells - cells derived from the ectoderm layer in the embryo. T
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The most powerful source of energy on the planet is actually out in space. It's our sun. More energy falls as sunlight on the US in a single day than it uses in a year. But it's been difficult to turn that sunlight into electricity. Many of us alread
自然百科2009年
1. 城市公共交通 urban public transport 城市中供公众乘用的、经济方便的各种交通方式的总称。 2. 公共交通方式 public transport mode 按公共交通工具类型划分的各种客运形式。 3. 城市公共交通系统
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By Zulima Palacio Washington 14 October 2009 One of the solar homes at this year's Solar Decathlon in Washington, DC On the National Mall in Washington, the 2009 Solar Decathlon has begun, with 20 university-led teams from four countries. Each has b
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