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https://www.nationalgeographic.com/science/2020/03/these-underlying-conditions-make-coronavirus-more-severe-and-they-are-surprisingly-common/
您即将离开知乎,请注意您的帐号和财产安全。
https://www.nationalgeographic.com/science/2020/03/these-underlying-conditions-make-coronavirus-more-severe-and-they-are-surprisingly-common/