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Openai/691a7e8b-c940-800c-ba7c-6b7be9ca9b27
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==== 3. 範圍與現實限制 ==== * 這只是非常粗略估算。實際每艘船年周轉次數可能高於或低於假設的 6 次。 * 有些原物料可能經由其他方式（鐵路、公路、內河）運輸，不一定都經海運。 * 散裝輪隊伍非常多樣，不是所有船都是超大型 (Capesize)，而小型或中型船 (如 Supramax、Handysize) 載量小、航次快但運量有限。 * 存在庫存和補庫 (restocking) 行為，例如中國企業可能建立大庫存，不是即需即運。 * 港口擁堵、裝卸效率、航道限制等因素也影響周轉效率。
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