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https://www.quora.com/How-long-did-it-take-to-travel-by-ship-to-Europe-from-China-in-the-19th-century
您即将离开知乎,请注意您的帐号和财产安全。
https://www.quora.com/How-long-did-it-take-to-travel-by-ship-to-Europe-from-China-in-the-19th-century