本篇聚焦“研发投入”与“研发人员”两大核心指标，从总量增长、结构分化、行业聚集与区域分布等多个维度，来观察近五年中国企业科创资源配置的真实图景与变迁。
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，详情可参考同城约会
garbage? Maybe we can allocate those on the stack?
// 易错点3：忘记stack.length判断 → 访问stack[-1]会报错