Nasa's Space Shuttle programme flew for three decades
const posToTime = new Map(); // 映射：位置 → 到达终点的时间
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// 弹出栈中「温度≤当前值」的索引（这些天无法成为当前天的「下一个高温」）
NASA leaders said the shakeup is meant to address a larger underlying problem: the U.S. agency is flying its most powerful rocket too infrequently and repeating some of the same technical issues from one mission to the next.