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2021—2025 年度,44 个行业研发投入金额呈现整体扩张的态势,说明重视研发不只是龙头和腰部企业的行为,而且成为了更加广泛的共同行动。另一方面,研发均值下滑的行业集中在末端,印证了行业整体分化的现象。典型案例来自房地产和教育行业,在“去杠杆”“双减”等政策催化下,市场步入格局重塑阶段,企业纷纷降本增效或是寻求转型路径。

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But what if it’s not fine? Even back in 1996, before a single component of the ISS was launched into orbit, NASA foresaw the possibility of an even worse worst-case scenario: an uncontrolled reentry. The crux of this scenario involves multiple systems failing in an improbable but not completely impossible cascade. Cabin depressurization could damage the avionics. The electrical power system could go offline, along with thermal control and data handling. Without these, systems controlling coolant and even propellant could break down. Unmoored, the ISS would edge slowly toward Earth, maybe over a year or two, with no way to control where it is headed or where its debris might land. And no, we could not save ourselves by blowing the station up. This would be extremely dangerous and almost certainly create an enormous amount of space trash—which is how we got into this hypothetical mess in the first place.

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