In 1942, at the height of British industrial war mobilization, an unlikely cohort scavenged the nation’s coastline for a precious substance. Among them were researchers, lighthouse keepers, members of the Royal Air Force and the Junior Red Cross, plant collectors from the County Herb Committee, Scouts and Sea Scouts, schoolteachers and students. They were looking for fronds and tufts of seaweed containing agar, a complex polysaccharide that forms the rigid cell walls of certain red algae.
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。关于这个话题，夫子提供了深入分析
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63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54
圖像來源，BBC CHINESE/ TING CHIANG