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子弹经过两百年的科学研究，从一个简单的铅球，变成性能极佳的弹药。科学新发现将介绍子弹的科学，以及子弹如何凭科技的进步，演化为现在的弹药。。The skies above our planet never stop moving. Wind, rain, drought and blizzards shape the lives of every living thing. In Australia, creatures are waiting for a force of nature from the north: the monsoon. Meanwhile in North America, the polar vortex dominates, causing extreme weather across the continent. Throughout Africa, animals are driven by an eternal search for water. So...。