其中之一便是一直杳无踪迹的来自白垩纪时期的保存良好的的羽毛化石。白垩纪处于一亿四千五百万年前到六千五百万年前之间，以恐龙的大规模灭绝为结束标志。
One such lacuna has been the absence of well-preserved feathers from the Cretaceous—the period between 145m and 65m years ago that ended with the mass extinction that wiped out the dinosaurs.
这份最新披露的文件，同样包括了美国空军的一份记载，一位飞行员说他被要求去击落一个在英格兰东部出现的不明飞行物，但是当他可以开火的时候，该物体已经杳无踪迹。
The newly released documents also carry an account by a U.S. Air Force pilot who says he was told to shoot down an unidentified flying craft over eastern England.
这份最新披露的文件，同样包括了美国空军的一份记载，一位飞行员说他被要求去击落一个在英格兰东部出现的不明飞行物，但是当他可以开火的时候，该物体已经杳无踪迹。
The newly released documents also carry an account by a U.S. Air Force pilot who says he was told to shoot down an unidentified flying craft over eastern England.
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