// 步骤3：从后往前遍历数组（反向遍历更易理解，每个元素只入栈/出栈一次）
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Households on a default dual-fuel tariff in Great Britain could cut costs by moving to a fixed deal
But in the worst worst-case scenario, we don’t have any control. Instead, the station will crack through the atmosphere. Sure, many pieces will likely end up in the ocean, but some might hit people, possibly in a town or a city. The station could break apart across thousands of miles and multiple continents. This would be exceedingly hard to anticipate. As NASA puts it, “Calculating the probability of this penetration cascading into loss of deorbit capability has a very large range of variables, making predictions ineffective.”