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来源: www.pewresearch.org/religion, www.bbc.co.uk/religion, www.religioustolerance.org, www.asia.si.edu (Smithsonian Freer-Sackler Galleries Asia), www.jstor.org (Journal of the American Academy of Religion), www.un.org/en/events/hajj, www.kumbhmela.in, www.caminodesantiago.gal