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来源: eji.org, encyclopediavirginia.org, encyclopediavirginia.org, slavevoyages.org, billofrightsinstitute.org, ldhi.library.cofc.edu, parliament.uk, scseagrant.org, thinkafrica.net, education.nationalgeographic.org, gresham.ac.uk, projectmanifest.eu, historicengland.org.uk, blackpast.org