Nature, Published online: 27 February 2026; doi:10.1038/d41586-026-00538-4
有趣的是，报告通过构建「2028 年宏观假想模型」，详细拆解了这一死循环的传导路径。
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A major construction project like this takes time, effort and money.
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需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。