中国海关数据显示，2025年中国自中东进口甲醇约980万吨，占国内贸易量30%-35%。与此同时，国内港口库存仍处同期低位。北半球春耕在即，尿素缺口可能直接推高农资成本。这不是单纯的油价问题，而是渗透进化工、农业、物流的全链条成本重构。
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a big goal of our paper was to really highlight how useful these operators really are. making it fast was more of a side-goal, so there would be less to complain about, as there was already a lot of disbelief, and we got comments such as it being a “theoretical curiosity”. i spent over a year experimenting with different approaches (there’s an initial draft on arXiv from 2023 where lookarounds had much worse complexity), but finally we found a combination that works extremely well in practice, and it helped me find a deeper intuition for what works both in theory and in the real world.
So row mapping goes:
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《太平年》项目在策划初期就已经明确将叙事重点落在吴越国主钱弘俶“纳土归宋”的抉择上，相当于“命题作文”。董哲手头可供参考的信史主要有《资治通鉴》《旧五代史》和《新五代史》三部，这些史料对五代的记述相对较多，涉及十国的部分少。