甚至还可以超出字符串本身的边界，比较与外部条件的一致性，如库存目录或当前公司股票价格。

They can even go outside the bounds of the string itself to compare its consistency with external conditions, such as the inventory of a warehouse or the current stock price of a company.

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GDS提供了超过550家航空公司、9万家酒店、3万家租车公司以及数百家大型旅行社和邮轮公司的库存与价格数据。

The GDSs provide access to more than 550 airlines, 90, 000 hotel properties, 30, 000 car rental locations, and hundreds of major tour operators and cruise lines.

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此前，由于钢铁需求下滑，加上与巴西生产商发生价格争议，中国停止了铁矿石进口，而依赖于库存。

China had halted iron ore imports and relied on stockpiles because of falling steel demand and a dispute over prices with Brazilian producers.

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