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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.
这个区分很重要，但它并不能消解所有担忧，只是让市场暂时喘了口气。