中国企业的研发投入绝对值，如果放在全球范围看，也是不可忽视的存在。根据《2025 欧盟工业企业研发投入记分牌》（The 2025EU Industrial R&D InvestmentScoreboard），全球研发投入前2000 家企业（以2024 年数据为准），最低入围门槛是6336 万欧元（约合5.22 亿元人民币），共有526家中国企业入围。
The algorithm also visits children in order of distance to the query point. This means it checks the most promising quadrants first, which tends to find a good candidate early and enables aggressive pruning of the remaining quadrants. Without this ordering, the algorithm would still produce the correct result, but it would prune fewer nodes.
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Pug found in a grave
for t := range c {