通往大房间的走道,卡尔斯巴德洞穴国家公园,新墨西哥州 (© Doug Meek/Getty Images)(Bing United States)

通往大房间的走道,卡尔斯巴德洞穴国家公园,新墨西哥州 (© Doug Meek/Getty Images)(Bing United States)

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