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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.，详情可参考搜狗输入法下载
to automate this activity, but it still represented one of the most ambitious
"The plight of the mackerel is part of a wider failure to take scientific advice intended to keep stocks healthy and able to recover from fishing pressure.