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过半行业研发人员均值下降，扩张退潮

Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00515-x

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// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4

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await Stream.pipeTo(source, writer);