Instead, Collins got them to give him a ride in the opposite direction, by telling them the plane had a nuclear weapon on board—a prearranged cover story to keep the Area 51 craft a secret.

但是，科林斯却请他们带他去相反的方向，他告诉他们这架飞机载有核武器————这是事先安排好的说辞，是为了保守51区飞机的秘密。

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Prepare a secret hideout for yourself should your cover be blown.

准备一个隐秘的藏身之处，入口处应该开满了鲜花。

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A literal image was the secret message and a still image was the cover message.

以二值文字图像为待隐藏的秘密信息，以静止图像为隐秘载体。

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Another document seen by the Times is said to be a memo from Mohsen Fakhrizadeh, naming him as the chairman of the Field for the Expansion of Deployment of Advance Technology (Fedat) - which the newspaper says is a cover for a secret nuclear weapons programme.

BBC: Ahmadinejad denies Iran nuclear bomb trigger tests

But as the spooks well know, once a secret is out it is hard to cover it up again.

ECONOMIST: ��Torture�� secrets revealed

Surveys of seabed nodules in 1970s were also used as a cover by the US for the secret retrieval of a lost Soviet submarine.

BBC: UK Seabed Resources joins deep-ocean mineral-mining rush