距离国家地理第一次推出封面照不足一年，1960年4月又推出喷气式蝶形潜水器封面照。
Less than a year after the first photograph appears on National Geographic, a jet-propelled diving saucer appears on the April 1960 cover.
距离国家地理第一次推出封面照不足一年，1960年4月又推出喷气式蝶形潜水器封面照。
Less than a year after the first photograph appears on National Geographic, a jet-propelled diving saucer appears on the April 1960 cover.
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