That's 500 more films than Hollywood produced during the same period, and only a few dozen of them have been declassified.
这是500多比好莱坞电影在同一时期生产的，其中只有几十已解密。
Today that secrecy has outlived its use, according to CIA historian David Robarge, explaining why the crash photos have been declassified.
今天，这个秘密已经失去它的使用价值，中情局历史学家大卫·罗巴尔表示，他还解释了为什么坠毁照片被解密的原因。
Newly declassified images have been released showing the devastating impact of global warming in Alaska.
最近被公开的已被解密的图片显示了全球变暖对美国阿拉斯加州的巨大影响。
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