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The freight system includes several distinct forms of transportation, called modes. The modes differ in terms of operating characteristics and capabilities, giving them comparative advantages and disadvantages. Each mode enjoys what might be called natural product provinces

货运系统包括几个不同的运输形式，称为模式。模式不同的经营特点和能力，让他们比较优势和劣势。每种模式都享有什么可以被称为天然产物省份。