Early in the second world war, Britain took its time to let America into the secrets of Ultra, the decryption of German secret communications by code-breakers at Bletchley Park.
第二次世界大战的早期，英国花时间让美国获知了Ultra的机密，这是电码译者在BletchleyPark破译的德国机密通信的译码。
Early in the second world war, Britain took its time to let America into the secrets of Ultra, the decryption of German secret communications by code-breakers at Bletchley Park.
第二次世界大战的早期，英国花时间让美国获知了Ultra的机密，这是电码译者在BletchleyPark破译的德国机密通信的译码。
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