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在华盛顿呼风唤雨的政治说客斯隆女士，在美国枪击事件接连发生的情况下，不惜牺牲自己的职业生涯，以督促政府实施更严格的联邦法律规范枪支。。In 2014, the International Space Station had to move three times to avoid lethal chunks of space debris and there is an increasing problem of satellites mysteriously breaking down. With first-hand accounts from astronauts and experts, Horizon reveals the scale of the problem of space junk. Our planet is surrounded by hundreds of millions of pieces of junk moving at 17,000 miles...。