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来源: history.state.gov, fordham.edu, sourcebooks.fordham.edu, metmuseum.org, libraries.mit.edu, archive.org, loc.gov, bl.uk, bodleian.ox.ac.uk, jstor.org, cambridge.org, islamichistory.org, medievalists.net, theatlantic.edu, anu.edu.au, history.ac.uk, nationalarchives.gov.uk, historicenvironment.scot