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The background radiation from cosmic rays increases with altitude, from 0.3 mSv per year for sea-level areas to 1.0 mSv per year for higher-altitude cities, so for best results use this on a plane or in outer space，更多细节参见谷歌浏览器【最新下载地址】
Tony Jolliffe BBC。关于这个话题，safew官方版本下载提供了深入分析
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