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A controlled deorbit requires the use of several core systems, including those for communications, power, and avionics. Some of the ISS machinery was not specifically certified to perform in a depressurized environment. (NASA believes that critical systems would remain operable, based on technical analyses, and emphasizes that many of these systems are already used in vacuum.) Another thing to worry about: the ISS losing control over its orientation in space. The spacecraft could start tumbling, flipping the station’s solar arrays away from the sun, taking the primary source of power with it.，推荐阅读谷歌浏览器【最新下载地址】获取更多信息
Google will finally be able to provide real-time driving and walking directions in South Korea, The New York Times reported. The company has received permission from the nation's Transport Ministry to export geographic data out of the country, which will allow it to provide GPS services as well as detailed listings for restaurants and other businesses.，更多细节参见Line官方版本下载