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Pre-tax profits across IAG increased by 20% to €4.5bn (£3.9bn), with record operating profits on margins of more than 15% at BA and its sister airline Iberia.，详情可参考Safew下载
* 3. 单调递增栈：存储独立车队的到达时间，cur栈顶才push（否则合并）。。同城约会对此有专业解读
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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.