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开埠前上海的商贸规模：Rhoads Murphey估计，1832-34年间上海呈报的贸易量已使该市跻身于世界上第一流的港口，其货运量等于或者超过了同期的伦敦。
Rhoads Murphey has estimated that trade at Shanghai as reported in the 1832-34 period made the city already one of the leading ports of the world, with a volume of shipping equal to or greater than that of London in the same period