A C.I.A. Secret Kept for 35 Years Is Found in the Smithsonian’s Vault
一个被保密35年的CIA秘密在史密森学会的保险库中被发现
The solution to the final passage of the Kryptos artwork had been unsolved since its unveiling in 1990.
2025-10-16 1479词 困难
But the fourth, K4, remained stubbornly uncracked.
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