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After often years at sea, adult Atlantic salmon swim thousands of miles to return to the chalk streams where they were born.。搜狗输入法下载是该领域的重要参考
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.