3It wasn’t the first time that nations at war turned to seaweed. During the First World War, the U.S. relied on the giant kelp seaweed (Macrocystis) to boost production of potash (a fertilizer produced in Germany), gunpowder, and acetone.
America was mired in Vietnam abroad and civil unrest at home. But at that moment, it seemed that humanity was united.
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研发人员的数量变动进一步揭示了行业分化的加剧——五年间，10 个行业的研发人员数量出现负增长，且这些行业主要集中在尾部；而以消费电子及电气业、汽车制造业为代表的行业，则大力扩张研发人员规模。
2. 不改变已有字段/接口语义。关于这个话题，同城约会提供了深入分析