求翻译：A less visible aspect of transportation is product storage. While a product is in a transportation vehicle, it is being stored. Transport vehicles can also be used for product storage at shipment origin or destination, but they are comparatively expensive storage facilities. Since the main value proposition of transportation is movement, a vehicle committed to storage is not otherwise available for transport. A trade-off exists between using a transportation vehicle versus temporarily placing products in a ware- house. If the inventory involved is scheduled to move within a few days to a different location, the cost of unloading, warehousing, and reloading the product may exceed the temporary charge of using the transportation vehicle for storage.是什么意思？

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